The Department of Housing and Urban Development (HUD) would like to test the
hypothesis that the average size of a newly constructed house last year is different from
the average size of a newly constructed house in 2000. The following data summarizes
the sample statistics for house sizes, in square feet, for both years. Assume that the
population variances are equal.
If Population 1 is defined as homes built in 2000 and Population 2 is defined as homes
built last year, and using α = 0.10, the critical value for this hypothesis test would be
________.
A) 1.691
B) 1.773
C) 2.060
D) 2.460
Suppose Burger King has run a major advertising campaign in the hopes of increasing
monthly sales. To investigate the effectiveness of this campaign, Burger King randomly
selected six restaurants and recorded the monthly sales before and after the advertising.
The following data represents these sales figures in thousands of dollars.
If Population 1 is defined as sales after the advertising campaign and Population 2 is
defined as sales before the advertising campaign, the correct hypothesis statement for
this hypothesis test would be ______________________.
A)
B)
C)
D)
Use the following information to answer the question(s) below.
A home appraisal company would like to develop a regression model that would predict
the selling price of a house based on the age of the house in years (Age), the living area
of the house in square feet (Living Area) and the number of bedrooms (Bedrooms). The
following Excel output shows the partially completed regression output from a random
sample of homes that have recently sold.
The degrees of freedom for the sum of squares regression are ________.
A) 3
B) 5
C) 11
D) 14
Your business statistics class had an exam last week. The average exam score for the
class is an example of ______________.
A) secondary data
B) qualitative data
C) descriptive statistics
D) inferential statistics
Use the following information to answer the question(s) below.
Ford would like to develop a regression model that would predict the number of cars
sold per month by a dealership employee based on the employee’s number of years of
sales experience (Exp), the employee’s weekly base salary before commissions (Salary),
and the education level of the employee. There are three levels of education in the sales
forcehigh school degree, associate’s degree, and bachelor’s degree. The following
dummy variables have been defined.
The following Excel output shows the partially completed regression output from a
random sample of employees from the previous month.
The test statistic for testing the significance of the ED1 variable is ________.
A) 1.75
B) 2.01
C) 2.20
D) 2.54
The federal government would like to test the hypothesis that the average age of men
filing for Social Security is higher than the average age of women set using α = 0.05
with the following data:
If Population 1 is defined as men and Population 2 is defined as women, which one of
the following statements is true?
A) Because the 90% confidence interval includes zero, we fail to reject the null
hypothesis and cannot conclude that the average age of men filling for social security is
more than the average age of women.
B) Because the 90% confidence interval does not include zero, we reject the null
hypothesis and cannot conclude that the average age of men filling for social security is
more than the average age of women.
C) Because the 90% confidence interval includes zero, we reject the null hypothesis and
conclude that the average age of men filling for social security is less than the average
age of women.
D) Because the 90% confidence interval does not include zero, we fail to reject the null
hypothesis and cannot conclude that the average age of men filling for social security is
more than the average age of women
________ are the consequences of the alternatives chosen given the states of nature that
eventually occur.in the field of decision analysis.
A) States of nature
B) Alternatives
C) Outcomes
D) Payoffs
The average class size this semester in the business school of a particular university is
38.1 students with a standard deviation of 12.9 students. The z-score for a class with 21
students is ________.
A) -1.33
B) 0
C) 0.80
D) 1.51
The Department of Education would like to test the hypothesis that the median debt
load of graduating students with a Bachelor’s degree is equal to $17,000. The following
table summarizes the debt load of a random sample of graduating students with a
Bachelor’s degree.
The p-value for this hypothesis test is ________.
A) 0.0456
B) 0.0733
C) 0.1357
D) 0.2714
Suppose Burger King has run a major advertising campaign in the hopes of increasing
monthly sales. To investigate the effectiveness of this campaign, Burger King randomly
selected seven restaurants and recorded the monthly sales before and after the
advertising. The following data represents these sales figures in thousands of dollars.
If Population 1 is defined as sales after the advertising campaign and Population 2 is
defined as sales before the advertising campaign, the standard deviation of the
matched-pair differences is ________.
A) 7.46
B) 10.58
C) 12.31
D) 15.72
Nationwide Insurance would like to perform a chi-square test to investigate whether a
difference exists in the proportion of male and female teenagers who text while they
drive. A random sample of 80 male teenagers found that 50 indicated they texted while
driving. A random sample of 120 female teenagers found that 65 indicated they texted
while driving. The expected frequency of female teenagers who text is ________.
A) 55
B) 65
C) 51
D) 69
A psychology class consists of 14 business students and 21 non-business students.
Sixteen students in this class are male. Eight students are both female and business
majors. The number of men in the class who are not business majors is ________.
A) 6
B) 8
C) 10
D) 11
A retail chain would like to test if a difference exists between the variability of
customer satisfaction scores from two locations. The following data represents
satisfaction scores from a random sample of customers from these locations on a scale
of 1-20.
The variance for the satisfaction scores at Location 1 would be ________.
A) 2.47
B) 3.83
C) 4.92
D) 7.00
The following data represents the ages of a household that consists of five people.
Assume that the household is considered a population in this example.
The variance of this data set is ________.
A) 200.0
B) 210.2
C) 225.6
D) 241.7
A golfer would like to test the hypothesis that the variance of his golf score equals 10.0.
The correct hypothesis statement would be ______________.
A)
B)
C)
D)
A respondent of a survey indicates that he is a resident in the state of Ohio. This is an
example of _________ data.
A) nominal
B) ordinal
C) interval
D) ratio
John’s commute time to work during the week follows the normal probability
distribution with a mean time of 26.7 minutes and a standard deviation of 5.1 minutes.
What is the probability that the commute time for a randomly selected day will be less
than 18 minutes?
A) 0.0436
B) 0.0778
C) 0.1271
D) 0.2236
A large statistics class meets on Monday, Wednesday, and Friday each week during the
semester. The following data shows the number of absent students for the last nine
classes.
The seasonal factor for Monday is ________.
A) 0.6127
B) 0.9479
C) 1.2268
D) 1.4143
The ________ measures the variation in the dependent variable that is explained by
variables other than the set of independent variables in multiple regression.
A) sum of squares within
B) sum of squares error
C) sum of squares regression
D) total sum of squares
The test statistic for the Kruskal-Wallis test follows the _____________ probability
distribution.
A) binomial
B) Student’s t
C) chi-square
D) normal
Use the information below to answer the following question(s).
The Marseille Water Taxi ferries tourists from the harbor at Marseille, France, to the
Frioul Islands in the Mediterranean Sea. The table below shows the number of
passengers on the noontime ferry over seven randomly selected days along with the
current ambient temperature in degrees Celsius.
Use the Marseille Water Taxi data to:
A) Calculate the coefficient of determination.
B) Interpret the meaning of the coefficient of determination.
C) Test the significance of the coefficient of determination using α = 0.05.
The following distribution shows the frequency distribution of the number of shots a
particular NBA player blocked in one game for a random sample of 100 games.
You have been assigned the task to test if the distribution of blocked shots per game for
this player follows the Poisson distribution using α = 0.05. The sample mean for this
distribution is ________.
A) 2.20
B) 2.60
C) 3.12
D) 3.47
Suppose Burger King has run a major advertising campaign in the hopes of increasing
monthly sales. To investigate the effectiveness of this campaign, Burger King randomly
selected seven restaurants and recorded the monthly sales before and after the
advertising. The following data represents these sales figures in thousands of dollars.
If Population 1 is defined as sales after the advertising campaign and Population 2 is
defined as sales before the advertising campaign, the test statistic for this hypothesis
test would be ________.
A)
B)
C)
D)
A professor would like to test the hypothesis that the median number of minutes that a
student needs to complete a statistics exam is equal to 50 minutes. The following
random sample of exam times from 12 students was collected to test this hypothesis.
Using α = 0.05, which one of the following statements is true?
A) Because the p-value is greater than α, we reject the null hypothesis and cannot
conclude that the median time to complete the exam is not equal to 50 minutes.
B) Because the p-value is greater than α, we fail to reject the null hypothesis and cannot
conclude that the median time to complete the exam is not equal to 50 minutes.
C) Because the p-value is less than α, we fail to reject the null hypothesis and conclude
that the median time to complete the exam is not equal to 50 minutes.
D) Because the p-value is less than α, we reject the null hypothesis and conclude that
the median time to complete the exam is not equal to 50 minutes.
The ________ frequencies refer to the frequencies that are most likely to occur if the
null hypothesis is true when performing a hypothesis test comparing two or more
population proportions.
A) relative
B) expected
C) cumulative
D) observed
A study conducted by UCLA’s Cooperative Institutional Research program found that
39.5% of college freshman spent six or more hours a week studying or doing homework
during their senior year in high school. To verify these results, a random sample of 200
freshmen was asked how many hours they studied a week during their senior year in
high school. A total of 88 students from this sample responded that they studied six or
more hours a week. Which of the following statements is correct?
A) The interval that contains 95% of the sample proportions is 0.3647 and 0.4253.
Because the sample proportion is between these two values, we have support for the
results of UCLA’s study.
B) The interval that contains 95% of the sample proportions is 0.3647 and 0.4253.
Because the sample proportion is not between these two values, we have support for the
results of UCLA’s study.
C) The interval that contains 95% of the sample proportions is 0.3272 and 0.4628.
Because the sample proportion is between these two values, we have support for the
results of UCLA’s study.
D) The interval that contains 95% of the sample proportions is 0.3272 and 0.4628.
Because the sample proportion is not between these two values, we do not have support
for the results of UCLA’s study.
Which one of the following scenarios would the use of nonparametric procedures not
be appropriate?
A) If the level of data measurement for the sample is only nominal or ordinal.
B) When calculating a confidence interval for the mean of a population when the
population’s standard deviation is not known.
C) When the sample size is very small (less than 30) because it will be difficult to test if
the population is normally distributed.
D) When there is no corresponding parametric procedure for the hypothesis test, such as
a test needed to estimate the median of a population.
AutoTrader.com would like to estimate the number of years owners keep the cars that
they purchased as a new vehicle. The following data shows the age of seven vehicles
that were sold for the first time by their owners.
4 12 3 10 7 4 5
Using this sample, the point estimate for the age of cars sold for the first time is
________.
A) 3.50
B) 4.86
C) 5.72
D) 6.43
You have been assigned to test the hypothesis that the variability for the number of
hours per week that an American works is equal to the variability for the number of
hours per week that a Swede works. The following data summarizes the sample
statistics for the number of hours worked per week for workers in each country.
The degrees of freedom for the critical value for Population 2 would be ________.
A) 11
B) 12
C) 14
D) 15
The average natural gas bill for a random sample of 26 homes in the 19808 zip code
during the month of March was $305.30 with a sample standard deviation of $46.50.
The margin of error for a 98% confidence interval around this sample mean is
________.
A) $18.69
B) $20.15
C) $22.66
D) $25.20