Test the claim that the samples come from populations with the same mean. Assume that the populations are normally distributed with the same variance.
-At the 0.025 significance level, test the claim that the four brands have the same mean if the following sample results have been obtained. $\begin{array}{llll}\text { brandA }&\text {brand B }&\text {brand C }&\text {brand D }\\hline
15 & 20 & 21 & 15 \
25 & 17 & 22 & 15 \
21 & 22 & 20 & 14 \
23 & 23 & 19 & 23 \
22 & & 18 & 22 \
20 & & & 28\&&&28
\end{array}$

Question

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.
-At the 0.025 significance level, test the claim that the four brands have the same mean if the following sample results have been obtained. $\begin{array}{llll}\text { brandA }&\text {brand B }&\text {brand C }&\text {brand D }\\hline
15 & 20 & 21 & 15 \
25 & 17 & 22 & 15 \
21 & 22 & 20 & 14 \
23 & 23 & 19 & 23 \
22 & & 18 & 22 \
20 & & & 28\&&&28
\end{array}$

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