homework 8.4

8.4.1. A simple random sample of 28 filtered 100-mm cigarettes is obtained from a normally distributed population, and the tar content of each cigarette is measured. The sample has a standard deviation of 0.20 mg. Use a 0.05 significance level to test the claim that the tar content of filtered 100-mm cigarettes has a standard deviation different from 0.30 mg, which is the standard deviation for unfiltered king-size cigarettes. Complete parts (a) through (d) below. a. What are the null and alternative hypotheses? O A Ho: a#0.30 mg O B. Ho: a= 0.30 mg H1: a= 0.30 mg H1 : a 0.30 mg O D. Ho: a= 0.30 mg H1: as 0.30 mg H1: a #0.30 mg