4/15/25, 10:44
AM
BUAL 2650 FINAL EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS VERIFIED GRADED A++
Leave the first rating
Save
Terms in this set (103)
An educator wanted to look at the In construction of the confidence interval, a t-value with 19 degrees of
study habits of university students. freedom was used.
As part of the research, data was
collected for three variables - the
amount of time (in hours per week)
spent studying, the amount of time
(in hours per week) spent playing
video games, and the GPA - for a
sample of 20 male university
students. As part of the research, a
95% confidence interval for the
average GPA of all male university
students was calculated to be: (2.95,
3.10). Which of the following
statements is true?
Private colleges and universities 183.738
rely on money contributed by
individuals and corporations for
their operating expenses. Much of
this money is invested in a fund
called an endowment, and the
college spends only the interest
earned by the fund. A recent
survey of eight private colleges in
the United States revealed the
following endowments (in millions
of dollars): 77.8, 45.1, 243.4, 489.5,
113.9, 187.6, 102.4, and 210.2. What
value will be used as the point
estimate for the mean endowment
of all private colleges in the United
States?
1/29
,4/15/25, 10:44
AM
2/29
, 4/15/25, 10:44
AM
Parking at a large university can be mu (U)
extremely difficult at times. One
particular university is trying to
determine the location of a new
parking garage. As part of their
research, officials are interested in
estimating the average parking
time of students from within the
various colleges on campus. Which
of the following would represent the
target parameter of interest?
What is Z a/2 when a=0.05? 1.96
A random sample of n measurements 74 +/- 4.9
was selected from a population with
unknown mean μ and known
standard deviation σ. Calculate a
95% confidence interval for μ for the
given situation. Round to the nearest
hundredth when necessary.
n=100,x=74, o=25
The registrar's office at State not meaningful because of the lack of random sampling.
University would like to determine a
95% confidence interval for the
mean commute time of its
students. A member of the staff
randomly chooses a parking lot and
surveys the first 125 students who
park in the chosen lot on a given
day. The confidence interval is
A random sample of 250 students at We are 95% confident that the average number of credit hours per
a university finds that these students quarter of students at the university falls in the interval 14.089 to
take a mean of 14.3 credit hours per 14.511 hours.
quarter with a standard deviation of
1.7 credit hours.
The 95% confidence interval for the
mean is 14.3 ± 0.211. Interpret the
interval.
What type of car is more popular We are 95% confident that the proportion of all college students who
among college students, American prefer American cars falls between .320 and .472.
or foreign? One hundred fifty-nine
college students were randomly
sampled and each was asked which
type of car he or she prefers. A
computer package was used to
generate the printout below of a
95% confidence interval for the
proportion of college students who
prefer American automobiles.
SAMPLE PROPORTION = .396
SAMPLE SIZE = 159
UPPER LIMIT = .472
LOWER LIMIT = .320
Which of the following is a correct
practical interpretation of the
interval?
A 90% confidence interval for the 2.15%
mean percentage of airline
3/29
AM
BUAL 2650 FINAL EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS VERIFIED GRADED A++
Leave the first rating
Save
Terms in this set (103)
An educator wanted to look at the In construction of the confidence interval, a t-value with 19 degrees of
study habits of university students. freedom was used.
As part of the research, data was
collected for three variables - the
amount of time (in hours per week)
spent studying, the amount of time
(in hours per week) spent playing
video games, and the GPA - for a
sample of 20 male university
students. As part of the research, a
95% confidence interval for the
average GPA of all male university
students was calculated to be: (2.95,
3.10). Which of the following
statements is true?
Private colleges and universities 183.738
rely on money contributed by
individuals and corporations for
their operating expenses. Much of
this money is invested in a fund
called an endowment, and the
college spends only the interest
earned by the fund. A recent
survey of eight private colleges in
the United States revealed the
following endowments (in millions
of dollars): 77.8, 45.1, 243.4, 489.5,
113.9, 187.6, 102.4, and 210.2. What
value will be used as the point
estimate for the mean endowment
of all private colleges in the United
States?
1/29
,4/15/25, 10:44
AM
2/29
, 4/15/25, 10:44
AM
Parking at a large university can be mu (U)
extremely difficult at times. One
particular university is trying to
determine the location of a new
parking garage. As part of their
research, officials are interested in
estimating the average parking
time of students from within the
various colleges on campus. Which
of the following would represent the
target parameter of interest?
What is Z a/2 when a=0.05? 1.96
A random sample of n measurements 74 +/- 4.9
was selected from a population with
unknown mean μ and known
standard deviation σ. Calculate a
95% confidence interval for μ for the
given situation. Round to the nearest
hundredth when necessary.
n=100,x=74, o=25
The registrar's office at State not meaningful because of the lack of random sampling.
University would like to determine a
95% confidence interval for the
mean commute time of its
students. A member of the staff
randomly chooses a parking lot and
surveys the first 125 students who
park in the chosen lot on a given
day. The confidence interval is
A random sample of 250 students at We are 95% confident that the average number of credit hours per
a university finds that these students quarter of students at the university falls in the interval 14.089 to
take a mean of 14.3 credit hours per 14.511 hours.
quarter with a standard deviation of
1.7 credit hours.
The 95% confidence interval for the
mean is 14.3 ± 0.211. Interpret the
interval.
What type of car is more popular We are 95% confident that the proportion of all college students who
among college students, American prefer American cars falls between .320 and .472.
or foreign? One hundred fifty-nine
college students were randomly
sampled and each was asked which
type of car he or she prefers. A
computer package was used to
generate the printout below of a
95% confidence interval for the
proportion of college students who
prefer American automobiles.
SAMPLE PROPORTION = .396
SAMPLE SIZE = 159
UPPER LIMIT = .472
LOWER LIMIT = .320
Which of the following is a correct
practical interpretation of the
interval?
A 90% confidence interval for the 2.15%
mean percentage of airline
3/29
