A cereal company claims that there are at least 80 raisins in every box of its raisin bran. You decide to test the claim at a significance level (alpha) of .05. You randomly sample 25 boxes of cereal made by the company and find the sample mean to be 77.8 raisins with a sample standard deviation of 5.5 raisins. 

(a) What are the null and alternate hypotheses?

(b) Draw the picture of the distribution of the test statistic (under H0). Include critical value(s) and region(s) of rejection.

(c) What is the calculated (computed) value of the test statistic? 

(d) What is your conclusion?

Answer rating: 100% (QA)

a The null hypothesis H0 is that there are at least 80 raisins in every box of raisin bran made by t... View the full answer