In Order to Compare the Life Expectancies of Three Different

Essay

In order to compare the life expectancies of three different brands of printers, eight printers of each brand were randomly selected. Information regarding the three brands is shown below.
$\begin{array}{llll}&\text { Brand A }&\text { Brand B }&\text { Brand C }\\\text { Average life in months) } & 62 & 52 & 60 \\\text { Sample variance } & 36 & 25 & 49\end{array}$
a. Compute the overall mean .
b. State the null and alternative hypotheses to be tested.
c. Show the complete ANOVA table for this test including the test statistic.
d. The null hypothesis is to be tested at 95% confidence. Determine the critical value for this test. What do you conclude?
e. Determine the p-value and use it for the test.