What Type of Car Is More Popular Among College Students $= .396226$

Multiple Choice

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 $= .396226$
SAMPLE SIZE $= 159$

$\mathrm { UPPER } \mathrm { LIMIT } = .46492$
LOWER LIMIT $= .331153$

Is the sample large enough for the interval to be valid?

A) No, the sample size should be at 10% of the population.
B) Yes, since n^p and n^q are both greater than 15.
C) No, the population of college students is not normally distributed.
D) Yes, since n > 30.