Hypothesis testing: Please help me with the sample problem 1 (two attachments, page 2 and 3).
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The first thing you have to know is what test should be done. In this case, you are seeing if there is a difference in the amount of tar between a few brands. Hence, you have to do an ANOVA (analysis of variance)
Therefore, the Null hypothesis is:
The Tar in brand A is equal to the tar in brand B which equals the tar in Brand C which is equal to tar of brand D
The alternative hypothesis the tar in ...
The solution discusses Anova, null hypothesis and critical value for tar brand A and tar brand B.