Data Analysis for Business Exam Solutions
Course Introduction
Data Analysis for Business introduces students to the fundamental concepts, tools, and techniques used to analyze data in a business context. The course covers key topics such as data collection and cleaning, descriptive and inferential statistics, data visualization, and the use of spreadsheet and statistical software. Students learn how to interpret data-driven insights to support business decision-making, identify trends, and solve real-world business problems. Through practical exercises and case studies, students gain hands-on experience in transforming raw data into actionable business strategies.
Recommended Textbook
Business Statistics in Practice 7th Edition by Bruce Bowerman
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10 Chapters
1299 Verified Questions
1299 Flashcards
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Chapter 1: An Introduction to Business Statistics
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60 Verified Questions
60 Flashcards
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Sample Questions
Q1) A study is being conducted on the effect of gas price on the number of miles driven in a given month.Residents in two cities,one on the East Coast and one on the West Coast are randomly selected and asked to complete a questionnaire on the type of car they drive,the number of miles they live from work,the number of children under 18 in their household,their monthly income,and the number of miles they have driven over the past 30 days.List the factor(s).
Answer: Factors in this study are location of residence,type of car,number of miles from work,number of children under 18,and monthly income. Feedback:Factors are related to the variable of interest.
Q2) If we examine some of the population measurements,we are conducting a census of the population.
A)True
B)False
Answer: False
Q3) In an experimental study,the aim is to manipulate or set the value of the response variable.
A)True
B)False
Answer: False
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Page 3
Chapter 2: Descriptive Statistics: Tabular and Graphical Methods
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101 Verified Questions
101 Flashcards
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Sample Questions
Q1) When we wish to summarize the proportion (or fraction)of items in a class,we use the frequency distribution for each class.
A)True
B)False
Answer: False
Q2) When developing a frequency distribution,the class (group)intervals should be
A)Large
B)Small
C)Integer
D)Mutually exclusive
E)Equal
Answer: D
Q3) Which of the following graphs is for qualitative data?
A)Histogram
B)Bar chart
C)Ogive plot
D)Stem-and-leaf
Answer: B
Page 4
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Chapter 3: Descriptive Statistics: Numerical Methods
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142 Verified Questions
142 Flashcards
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Sample Questions
Q1) In a statistics class,10 scores were randomly selected with the following results: 74,73,77,77,71,68,65,77,67,66
What is the 65<sup>th</sup> percentile?
A)65.5
B)67.3
C)66.75
D)74.0
E)77.0
Answer: D
Q2) The average life of Canadian women is 73.75 years,and the standard deviation of women's life expectancy in Canada is 6.5 years.Based on Chebyshev's inequality,determine the upper and lower bounds on the average life expectancy of Canadian women such that at least 90 percent of the population is included.
A)[12.09 135.41]
B)[8.75 138.75]
C)[53.20 94.30]
D)[66.38 81.13]
E)[67.25 80.25]
Answer: C
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Page 5
Chapter 4: Probability
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144 Verified Questions
144 Flashcards
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Sample Questions
Q1) At a college,70 percent of the students are women,and 50 percent of the students receive a grade of C.25 percent of the students are neither female nor C students.Use this contingency table.
\(\begin{array} { l c c r } & \mathrm { C } & \overline { \mathrm { C } } & \\
\text { Women } & .45 & .25 & .70 \\
\text { Men } & .05 & .25 & .30 \\ & .50 & .50 & 1.00
\end{array}\)
A).45
B).50
C).70
D).25
E).05
Q2) Two events are independent if the probability of one event is influenced by whether or not the other event occurs.
A)True
B)False
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Chapter 5: Discrete Random Variables
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155 Verified Questions
155 Flashcards
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Sample Questions
Q1) Consider the experiment of tossing a fair coin three times and observing the number of heads that result (X = number of heads).What is the standard deviation for this distribution?
A)1.5
B)1.22
C)0.75
D)0.87
Q2) The variable "home ownership" can take on one of two values,1 if the person living in a home owns the home and zero if the person living in a home does not own the home.This is an example of a discrete random variable.
A)True
B)False
Q3) Suppose that x has a hypergeometric distribution with N = 10,r = 5,and n = 3.Calculate the standard deviation of the distribution.
A)0.583
B)0.764
C)1.500
D)0.778
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Chapter 6: Continuous Random Variables
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150 Verified Questions
150 Flashcards
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Sample Questions
Q1) The weight of a product is normally distributed with a standard deviation of .5 ounces.What should the average weight be if the production manager wants no more than 5 percent of the products to weigh more than 5.1 ounces?
A)4.278
B)4.409
C)3.455
D)5.922
Q2) A property of continuous distributions is that:
A)As with discrete random variables,the probability distribution can be approximated by a smooth curve.
B)Probabilities for continuous variables can be approximated using discrete random variables.
C)Unlike discrete random variables,probabilities can be found using tables.
D)Unlike discrete random variables,the probability that a continuous random variable equals a specific value is zero [P(X = x)= 0].
Q3) The z value tells us the number of standard deviations that a value x is from the mean.
A)True
B)False
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Chapter 7: Sampling and Sampling Distributions
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132 Verified Questions
132 Flashcards
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Sample Questions
Q1) The Central Limit Theorem states that as sample size increases,the population distribution more closely approximates a normal distribution.
A)True
B)False
Q2) According to a hospital administrator,historical records over the past 10 years have shown that 20 percent of the major surgery patients are dissatisfied with after-surgery care in the hospital.A scientific poll based on 400 hospital patients has just been conducted.What is the probability that at least 70 patients will not be satisfied with the after-surgery care?
A)89.44%
B)39.44%
C)10.56%
D)78.88%
E)84.49%
Q3) Find \(\mathrm { P } ( \bar { X } < 35 )\) If ? = 40,?<sub>x</sub> = 16,n = 16.
A).9944
B).4483
C).5517
D).1056
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Page 9
Chapter 8: Confidence Intervals
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149 Verified Questions
149 Flashcards
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Sample Questions
Q1) When the sample size and the sample proportion \(\hat { p }\)
Remain the same,a 90 percent confidence interval for a population proportion p will be ______________ the 99 percent confidence interval for p.
A)Wider than
B)Narrower than
C)Equal to
Q2) When determining the sample size,if the value found is not an integer initially,you should ____________ choose the next highest integer value.
A)Always
B)Sometimes
C)Never
Q3) As the sample size n increases,the width of the confidence interval
A)Stays the same
B)Decreases
C)Increases
Q4) When sample size is 16,find t<sub>.10</sub>.
Q5) When sample size is 11,find t<sub>.001</sub>.
Q6) When sample size is 11,find t<sub>.025</sub>.
10
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Chapter 9: Hypothesis Testing
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148 Verified Questions
148 Flashcards
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Sample
Questions
Q1) A mail-order business prides itself in its ability to fill customers' orders in less than six calendar days,on average.Periodically,the operations manager selects a random sample of customer orders and determines the number of days required to fill the orders.On one occasion when a sample of 39 orders was selected,the average number of days was 6.65 with a population standard deviation of 1.5 days.What is the critical value for = .10 to test the hypotheses.
Q2) A null hypothesis H<sub>0</sub>: 2.4 is not rejected at a significance level of 0.04.( = 0.04).The standard deviation for the normally distributed population is known to be 0.40.Determine the Type II error,if we assume that the actual mean is 2.125 based on a sample size of 16.
Q3) A major car manufacturer wants to test a new catalytic converter to determine whether it meets new air pollution standards.The mean emission of all converters of this type must be less than 20 parts per million of carbon.Ten (10)converters are manufactured for testing purposes and their emission levels are measured,with a mean of 17.17 and a standard deviation of 2.98.Calculate the appropriate test statistic to test the hypotheses.
Q4) In testing H<sub>0</sub>: p .33;versus H<sub>A</sub>: p < .33,with \(\hat { p }\) = .20 and n = 100,what is the value of the test statistic?
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Page 11
Chapter 10: Comparing Two Means and Two Proportions
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118 Verified Questions
118 Flashcards
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Sample Questions
Q1) In an opinion survey,a random sample of 1000 adults from the United States and 1000 adults from Germany were asked whether they supported the death penalty.590 American adults and 560 German adults indicated that they supported the death penalty.The researcher wants to know whether there is sufficient evidence to conclude that the proportion of adults who support the death penalty is higher in the United States than in Germany.What is the rejection point (critical value of the test statistic)at = .05?
Q2) The registrar at a state college is interested in determining whether there is a difference of more than one credit hour between male and female students in the average number of credit hours taken during a term.She selected a random sample of 60 male and 60 female students and observed the following sample information. \(\begin{array} { l l l }
& \text { Male } & \text { Female } \\
\text { Sample Mean } & 13.24 & 14.68 \\
\text { Population Std Dev } & 1.2 & 1.56 \\
\text { Sample Size } & 60 & 60
\end{array}\)
Calculate the test statistic to be used in the analysis.Assume unequal variances.
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Page 12