Amarketing research firm is estimating which of two sodas (a or b) college students prefer. a random sample of 75 college students was chosen in which 45 preferred soda a. is this sample large enough to calculate a confidence interval?

Step-by-step explanation:

Given that a marketing research firm is estimating which of two sodas (A or B) college students prefer.

Sample size of 75 was taken at random.

Since sample size is sufficiently large i.e. >30, and also since samples are taken at random, we can assume that sample proportion

p= follows a normal distribution with mean = 0.6 and variance = npq = 75(0.6)(0.4)

Yes, this sample is large enough to calculate a confidence interval.

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