Hi,

I got a test stat of 1.697, which does not fall in the rejection region of >1.96. I would say that we could not reject the null hypothesis.(the null hypothesis is that the mean is 2.6) The data supports the null hypothesis, that the average is 2.6. Our professor would cringe if she saw the "truly" word up there. She has reminded us over and over that we do not know the true value, only what the data say. If you look at the first line of the problem, it says "estimated that....would have eaten 2.6 pounds" . Noone knows the true value. I would have to say that the answer is A. Calculate a 90% confidence interval for the mean of the sample and I bet A is the correct answer.

Again, you always say that the data supports the null hyp. or supports rejecting the null. You'll never be able to say what the true or actual value of a statistic is.

Hope this helps