Operations Management
Exam Materials
Course Introduction
Operations Management explores the design, operation, and improvement of the systems and processes that organizations use to produce goods and deliver services. This course covers key concepts such as process analysis, quality management, supply chain management, inventory control, forecasting, scheduling, and lean operations. Students learn to apply quantitative and qualitative methods to optimize efficiency, reduce costs, and enhance customer satisfaction in a variety of operating environments. Emphasis is placed on real-world applications, decision-making tools, and the strategic role of operations in gaining a competitive advantage.
Recommended Textbook
Business Statistics A Decision Making Approach 8th Edition by David F. Groebner
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19 Chapters
2260 Verified Questions
2260 Flashcards
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Page 2
Chapter 1: The Where, why, and How of Data Collection
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167 Verified Questions
167 Flashcards
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Sample Questions
Q1) When data are organized into levels,the highest data level is:
A)interval level data.
B)nominal level data.
C)ordinal level data.
D)ratio level data.
Answer: D
Q2) One of the advantages of data check sheets is that as the data are being recorded,they are also being displayed in a useful format.
A)True
B)False
Answer: True
Q3) When the marketing manager for a large company surveys a portion of the total customers of his company,he is using a sample from the population.
A)True
B)False
Answer: True
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Chapter 2: Graphs,charts and Tablesdescribing Your Data
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138 Verified Questions
138 Flashcards
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Sample Questions
Q1) A bar chart is most likely used to display which of the following?
A)A continuous variable
B)A nominal level variable
C)An ordinal level variable
D)Either B or C
Answer: D
Q2) Consider a situation in which both a frequency distribution and a relative frequency distribution have been developed for the same quantitative variable.If histograms are constructed from each distribution,the graphs will appear to have the same shape.
A)True
B)False
Answer: True
Q3) A scatter diagram can show that the relationship between two variables is actually nonlinear.
A)True
B)False
Answer: True
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Chapter 3: Describing Data Using Numerical Measures
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130 Flashcards
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Sample Questions
Q1) The owner of a local gasoline station has kept track of the number of gallons of regular unleaded sold at his station every day since he purchased the station.This morning,he computed the mean number of gallons.This value would be considered a statistic.
A)True
B)False
Answer: False
Q2) If a data set has 1,133 sorted values,what value corresponds to the 3<sup>rd</sup> quartile?
A)The 250<sup>th</sup> value
B)The 850<sup>th</sup> value
C)The 760<sup>th</sup> value
D)The 849<sup>th</sup> value
Answer: B
Q3) The most frequently used measure of central tendency is:
A)median.
B)mean.
C)mode.
D)middle value.
Answer: B
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Chapter 4: Using Probability and Probability Distributions
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Sample Questions
Q1) When the salesperson makes a sale,there are three possible sales levels: large,medium,and small.The probability of a large sale is 0.20 and the chance of a medium sale is 0.60.Thus,when a sale is made,the chance of it being a small sale is 0.20.
A)True B)False
Q2) List three methods of assessing probabilities and indicate which is least likely to be used in business decision making.
Q3) The accountant for a large U.S.company is interested in finding the probability that an account will have an incorrect balance due to being overstated or being understated.To find this probability,which probability rule is she likely to use?
Q4) Two football teams play in the Super Bowl.The event of team A winning and the event of team B winning can be said to be mutually exclusive. A)True B)False
Q5) Explain what is meant by the term mutually exclusive events.Cite an example.
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Chapter 5: Discrete Probability Distributions
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119 Flashcards
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Sample Questions
Q1) The distribution for the number of emergency calls to a city's 911 emergency number in a one-hour time period is likely to be described by a binomial distribution.
A)True
B)False
Q2) The primary difference between the binomial distribution and the Poisson distribution is that the Poisson is used to describe a continuous random variable and the binomial is used for discrete random variables.
A)True
B)False
Q3) The manager of a movie theater has determined that the distribution of customers arriving at the concession stand is Poisson distributed with a standard deviation equal to 2 people per 10 minutes.What is the probability that 0 customers arrive during a 10-minute period?
A)0.1353
B)0.0183
C)0.9817
D)Essentially 0
Q4) Under what conditions is the binomial distribution symmetric?
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7
Chapter 6: Introduction to Continuous Probability
Distributions
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90 Flashcards
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Sample Questions
Q1) If the mean,median and mode are all equal for a continuous random variable,then the random variable is normally distributed.
A)True
B)False
Q2) In a standard normal distribution,the probability P(-1.00< Z < 1.20)is the same as A)P(1<Z<1.20)- P(0<Z<1.00).
B)P(1<Z<1.20)- 2*P(0<Z<1.00).
C)2*P(1<Z<1.20)- P(0<Z<1.00).
D)P(1<Z<1.20)+ 2*P(0<Z<1.00).
Q3) It is assumed that the time failures for an electronic component are exponentially distributed with a mean of 50 hours between consecutive failures.If one extra component is installed as a backup,what is the probability of at least one of the two components working for at least 60 hours?
A)About 0.51
B)About 0.09
C)About 0.06
D)About 0.70
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Page 8
Chapter 7: Introduction to Sampling Distributions
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Sample Questions
Q1) When a population is not normally distributed,the Central Limit Theorem states that a sufficiently large sample will result in the sample mean being normally distributed.
A)True
B)False
Q2) How would you respond to a statement that says that by increasing the sample size,the amount of sampling error will be decreased?
Q3) A larger sample size reduces the potential for large sampling error.
A)True
B)False
Q4) A sampling distribution is the distribution of the individual values that are included in a sample from a population.
A)True
B)False
Q5) It is very unlikely that a nonstatistical sample will ever provide less sampling error than a statistical sample of the same size.
A)True
B)False
Q6) Explain what is meant by the concept of sampling distribution.
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Chapter 8: Estimating Single Population Parameters
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145 Flashcards
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Sample Questions
Q1) A Parks and Recreation official surveyed 200 people at random who have used one of the city's parks.The survey revealed that 26 resided outside the city limits.If she had to arrive at one single value to estimate the true proportion of park users who are residents of the city it would be 0.13.
A)True
B)False
Q2) In discussing a confidence interval estimate for a population mean,is it acceptable to provide an interpretation like the following: "There is a 95 percent chance that lies in the range 20 to 40"?
Q3) Twenty one (21)customers out of a simple random sample of 50 said that they came to the grocery store within one month after getting a card from the company.Based on the data,the marketing manager thinks that the number of total customers who would come in to the grocery store within one month is 4,200 because 10,000 cards were mailed.
A)True
B)False
Q4) What are the disadvantages of using a small sample to estimate the population mean?
Q5) Under what circumstances would you wish to select a pilot sample?
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Chapter 9: Introduction to Hypothesis Testing
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129 Flashcards
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Sample Questions
Q1) For a given sample size n,if the level of significance ( )is decreased,the power of the test:
A)will increase.
B)will decrease.
C)will remain the same.
D)cannot be determined.
Q2) Mike runs for the president of the student government and is interested to know whether the proportion of the student body in favor of him is significantly more than 50 percent.A random sample of 100 students was taken.Fifty-five of them favored Mike.At a 0.05 level of significance,it can be concluded that the proportion of the students in favor of Mike
A)is significantly greater than 50 percent because 55 percent of the sample favored him.
B)is not significantly greater than 50 percent.
C)is significantly greater than 55 percent.
D)is not significantly different from 55 percent.
Q3) In a hypothesis test,the p-value measures the probability that the alternative hypothesis is true.
A)True
B)False
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Chapter 10: Estimation and Hypothesis Testing for Two
Population
Parameters
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97 Verified Questions
97 Flashcards
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Sample Questions
Q1) To find a confidence interval on the difference between the means of independent samples,when the variances are unknown but assumed equal,the sample sizes of the two groups must be the same.
A)True
B)False
Q2) To find the pooled standard deviation involves taking a weighted average of the two sample variances,then finding its square root.
A)True
B)False
Q3) If the sample data lead us to suspect that the variances of the two populations are not equal,the t-test statistic and the degrees of freedom must be adjusted accordingly. A)True
B)False
Q4) Two samples are said to be independent if they are collected at different points in time.
A)True B)False
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Chapter 11: Hypothesis Tests and Estimation for Population
Variances
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71 Verified Questions
71 Flashcards
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Sample Questions
Q1) The F-distribution is used to test whether two sample variances are equal.
A)True
B)False
Q2) In a two-tailed test for the equality of two variances,the critical value is determined by going to the F-distribution table with an upper-tail area equal to alpha divided by two.
A)True
B)False
Q3) If a hypothesis test for a single population variance is to be conducted,which of the following statements is true?
A)The null hypothesis must be stated in terms of the population variance.
B)The chi-square distribution is used.
C)If the sample size is increased,the critical value is also increased for a given level of statistical significance.
D)All of the above are true.
Q4) The F-distribution can only have positive values.
A)True
B)False
13
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Chapter 12: Analysis of Variance
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137 Verified Questions
137 Flashcards
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Sample Questions
Q1) A study was recently conducted to see whether the mean starting salaries for graduates of engineering,business,healthcare,and computer information systems majors differ.A random sample of 8 graduates was selected from each major.If the test is to be conducted using an alpha = 0.05 level,the critical value will be F = 3.838.
A)True
B)False
Q2) Recently,a company tested three different machine types to see if there was a difference in the mean thickness of products produced by the three.A random sample of ten products was selected from the output from each machine.Given this information,the proper design to test whether the means are equal is a one-way ANOVA balanced design.
A)True
B)False
Q3) The Tukey-Kramer method for multiple comparisons can only be used when the analysis of variance design is balanced.
A)True
B)False
Q4) Explain what is meant by partitioning the sum of squares in a one-way analysis of variance application.
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Chapter 13: Goodness-Of-Fit Tests and Contingency Analysis
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Sample Questions
Q1) A goodness-of-fit test can be used to determine whether a set of sample data comes from a specific hypothesized population distribution.
A)True
B)False
Q2) The goodness of test is essentially determining if the test statistic is significantly larger than zero.
A)True
B)False
Q3) If the sample size is large,the standard normal distribution can be used in place of the chi-square in a goodness-of-fit test for testing whether the population is normally distributed.
A)True
B)False
Q4) If the null hypothesis is not rejected,you do not need to worry when the expected cell frequencies drop below 5.0.
A)True
B)False
Q5) Explain the basic logic behind the chi-square goodness-of-fit test.
Page 15
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Chapter 14: Introduction to Linear Regression and Correlation Analysis
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136 Flashcards
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Sample Questions
Q1) When a correlation is found between a pair of variables,this always means that there is a direct cause and effect relationship between the variables.
A)True
B)False
Q2) If the correlation between income and number of years of education is positively correlated,the scatter plot will show more points in the lower left and upper right quadrants than in the other two quadrants.
A)True
B)False
Q3) The values of the regression coefficients are found such the sum of the residuals is minimized.
A)True
B)False
Q4) In conducting a hypothesis test for a correlation,the correct probability distribution to use is the F distribution.
A)True
B)False
Q5) Explain what is meant by the term least squares regression model.
Page 16
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Chapter 15: Multiple Regression Analysis and Model Building
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153 Flashcards
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Sample Questions
Q1) The best subsets method will involve trying fewer different regression models than stepwise regression.
A)True
B)False
Q2) Which of the following is not an assumption of the multiple regression model?
A)The mean of the residuals is equal to the variance at all combinations of levels of the independent variables.
B)The regression error terms are normally distributed.
C)The model error terms are independent.
D)The residuals have a constant variance for all combinations of values for the independent variables.
Q3) The variance inflation factor is an indication of how much multicollinearity there is in the regression model.
A)True
B)False
Q4) Stepwise selection will always find the best regression model.
A)True
B)False
Page 17
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Chapter 16: Analyzing and Forecasting Time-Series Data
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133 Flashcards
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Sample Questions
Q1) Which of the following statistical measures is used to help decision makers assess the potential for their model to provide usable forecasts?
A)The mean absolute deviation
B)The mean square error
C)Both A and B
D)Neither A nor B
Q2) In measuring forecast errors,the MAD and the square root of the MSE will provide similar (but not identical)values,in that both provide a measure of the "typical" amount of error in forecasts.
A)True
B)False
Q3) In order to identify a cyclical component in time-series data,one year of weekly data should be sufficient.
A)True
B)False
Q4) While virtually all time series exhibit a random component,not all time series exhibit other components.
A)True
B)False
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Chapter 17: Introduction to Nonparametric Statistics
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Sample Questions
Q1) The Wilcoxon signed rank test should be used in place of the t-test whenever the sample size is less than 20.
A)True
B)False
Q2) The critical value for a Kruskal Wallis test is an F value from the F-distribution.
A)True
B)False
Q3) In a Kruskal-Wallis test when ties occur,each observation is given the ________ for which it is tied.
A)highest rank
B)lowest rank
C)mean rank
D)median rank
Q4) When testing whether two paired populations have equal medians and the sample sizes are large,it is appropriate to convert the Wilcoxon Matched-Pairs Signed Rank test to a paired sample t-test.
A)True
B)False
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Chapter 18: Introduction to Quality and Statistical Process Control
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Sample Questions
Q1) A trend chart would be useful for displaying the improvement that a company is making in the number of customer defects observed.
A)True
B)False
Q2) According to Deming's 14 points,Dr.Deming would favor a quality program that sets specific quality goals or targets.
A)True
B)False
Q3) Juran argued that by employing the Pareto principle,companies could focus their quality efforts on the few most important areas for improvement.
A)True
B)False
Q4) Brainstorming is a good way to determine the correct solution to a quality improvement problem.
A)True
B)False
Q5) Referring to the SPC chart signals that a process is out of control,what type of problem does each signal indicate? List the signals.
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Chapter 19: Introduction to Decision Analysis
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Sample Questions
Q1) Which of the following is true regarding decision making environments?
A)Most business decisions are made in an environment of uncertainty.
B)Most business decisions are made in an environment of certainty.
C)Certainty means that probabilities of each possible outcome are known.
D)Uncertainty means that probabilities of each possible outcome are known.
Q2) The expected value of perfect information (EVPI)is the minimum amount a manager would expect to pay to obtain perfect information.
A)True
B)False
Q3) Which of the following is true?
A)The expected value under certainty is equal to the expected cost of uncertainty minus the expected value under uncertainty.
B)The expected value under uncertainty is equal to the expected cost of uncertainty minus the expected value under certainty.
C)The expected cost of uncertainty is equal to the expected value under uncertainty minus the expected value under certainty.
D)The expected cost of uncertainty is equal to the expected value under certainty minus the expected value under uncertainty.
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