Question

The decrease in cholesterol level after eating a certain brand of oatmeal for breakfast for one month in people with cholesterol levels over 200 is Normally distributed, with mean (in milligrams) μ and standard deviation σ = 3. The brand advertises that eating its oatmeal for breakfast daily for one month will produce a mean decrease in cholesterol of more than 10 points for people with cholesterol levels over 200, but you believe that the mean decrease in cholesterol is actually less than advertised. To explore this, you test the hypotheses and you obtain a P-value of 0.052. Which of the following is true?

Answer 1

(i had this question the other day it is) C.
There is some evidence against H0, and a study using a largersample size may be worthwhile.

Answer 2

some evidence against H0 can be seen, and a study using a larger sample size will be recommended

Explanation:

The decrease in cholesterol level after eating a certain brand of oatmeal for breakfast for one month in people with cholesterol levels over 200 is Normally distributed, with mean (in milligrams) μ and standard deviation σ = 3. The brand advertises that eating its oatmeal for breakfast daily for one month will produce a mean decrease in cholesterol of more than 10 points for people with cholesterol levels over 200, but you believe that the mean decrease in cholesterol is actually less than advertised. To explore this, you test the hypotheses and you obtain a P-value of

going by the parameters

standard deviation is 3

mean of the sample=μ

There is some evidence against H0, and a study using a larger sample size will be essential