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Author Question: What type of car is more popular among college students, American or foreign? One hundred fifty-nine ... (Read 92 times)

tiara099

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on: Feb 14, 2020

Question 1

A marketing research company is estimating which of two soft drinks college students prefer. A random sample of 341 college students produced the following 95% confidence interval for the proportion of college students who prefer one of the colas: What additional assumptions are necessary for the interval to be valid?
◦ The sample was randomly selected from an approximately normal population.
◦ No additional assumptions are necessary.
◦ The sample proportion equals the population proportion.
◦ The population proportion has an approximately normal distribution.

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 for the proportion of college students who prefer American automobiles.

SAMPLE PROPORTION = .396226
SAMPLE SIZE = 159

UPPER LIMIT = .46418
LOWER LIMIT = .331125

Is the sample large enough for the interval to be valid?
◦ No, the population of college students is not normally distributed.
◦ Yes, since n and n are both greater than 15.
◦ No, the sample size should be at 10% of the population.
◦ Yes, since n > 30.
Statistics ¦ McClave, Sincich, Tamarack ¦ 12th Edition
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Marked as best answer by tiara099 on Feb 14, 2020

scottmt

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Reply #1 on: Feb 14, 2020
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tiara099

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Reply 2 on: Feb 14, 2020
Great answer, keep it coming :)

tanna.moeller

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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