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 90% confidence interval for the proportion of college students who prefer American automobiles. SAMPLE PROPORTION = .396 SAMPLE SIZE = 159 UPPER LIMIT = .460 LOWER LIMIT = .332 Based on the interval above, do you believe that 21% of all college students prefer American automobiles?
A) No, and we are 90% confident of it.
B) Yes, and we are 100 %sure of it.
C) Yes, and we are 90% confident of it.
D) No, and we are 100% sure of it.

Question

Quizplus · Accepted Answer

The 90% confidence interval for the proportion of college students who prefer American automobiles is from 0.332 to 0.460. Since 0.21 is not within this interval, we are 90% confident that the true proportion is not 21%.

What Type of Car Is More Popular Among College Students