Question 1
What type of car is more popular among college students, American 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 for the proportion of college students who prefer American automobiles.
SAMPLE PROPORTION = .394141
SAMPLE SIZE = 159
UPPER LIMIT = .464240
LOWER LIMIT = .331153
What proportion of the sampled students prefer foreign automobiles?
◦ .605859
◦ .464240
◦ .331153
◦ .394141
Question 2
What type of car is more popular among college students, American 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?
◦ We are 95% confident that the proportion of all college students who prefer foreign cars falls between
and
.
◦ We are 95% confident that the proportion of the 159 sampled students who prefer American cars falls between
and
.
◦ We are 95% confident that the proportion of all college students who prefer American cars falls between
and
.
◦ 95% of all college students prefer American cars between
and
of the time.
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