Test the claim that the samples come from populations with the same mean. Assume that the populations are normally distributed with the same variance.
-A consumer magazine wants to compare the lifetimes of ballpoint pens of three different types. The magazine takes a random sample of pens of each type in the following table.

$\begin{array} { l }
\text { Brand A}&\text { Brand B}&\text { Brand C }\\hline
260&181&238\218&240&257\184&162&241\219&218&213
\end{array}$
Do the data indicate that there is a difference in mean lifetime for the three brands of ballpoint pens? $\text { Use } \alpha = 0.01 \text {. }$

Question

Test the claim that the samples come from populations with the same mean. Assume that the populations are normally distributed with the same variance.
-A consumer magazine wants to compare the lifetimes of ballpoint pens of three different types. The magazine takes a random sample of pens of each type in the following table.

$\begin{array} { l  } 
\text { Brand A}&\text { Brand B}&\text { Brand C }\\hline
260&181&238\218&240&257\184&162&241\219&218&213
\end{array}$
 Do the data indicate that there is a difference in mean lifetime for the three brands of ballpoint pens?  $\text { Use } \alpha = 0.01 \text {. }$

Quizplus · Accepted Answer

The Answer of Test the claim that the samples come from populations with the same mean. Assume that the populations are normally distributed with the same variance.
-A consumer magazine wants to compare the lifetimes of ballpoint pens of three different types. The magazine takes a random sample of pens of each type in the following table.

$\begin{array} { l  } 
\text { Brand A}&\text { Brand B}&\text { Brand C }\\hline
260&181&238\218&240&257\184&162&241\219&218&213
\end{array}$
 Do the data indicate that there is a difference in mean lifetime for the three brands of ballpoint pens?  $\text { Use } \alpha = 0.01 \text {. }$

Test the Claim That the Samples Come from Populations with the Same