A veterinarian investigating possible causes of enteroliths in horses suspects t

Question

A veterinarian investigating possible causes of enteroliths in horses suspects that feeding alfalfa may be to blame. She wishes to estimate the proportion of horses with enteroliths who are fed at least two flakes of alfalfa per day. In a sample of 62 horses with enteroliths she finds 42 are fed two or more flakes of alfalfa. She wants to calculate a 95% confidence interval and decides to use the large sample method. This is:

A. justified because the sample size is larger than 30.

B. justified because (np ) and (1 np) are at least 15.

C. justified because the majority of horses are fed at least two flakes per day.

D. not justified because the true proportion needs to be p = 0.50

I'm really confused on how to do this! :(

Explanation / Answer

She wants to calculate a 95% confidence interval and decides to use the large sample method. This is:

A. justified because the sample size is larger than 30.

as you can see the sample size of horses is 62

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