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. $\begin{array} { l }
\text { Brand A } &\text{Brand }\mathrm{B}& \text { Brand } \mathrm{C} &\text { Brand D }\\hline
15&20&21&15\25&17&22&15\21&22&20&14\23&23&19&23\22&&18&22\20&&&28\&&&28
\end{array}$

Question

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. $\begin{array} { l  } 
\text { Brand A  } &\text{Brand }\mathrm{B}& \text { Brand } \mathrm{C} &\text { Brand D }\\hline
15&20&21&15\25&17&22&15\21&22&20&14\23&23&19&23\22&&18&22\20&&&28\&&&28
\end{array}$

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. $\begin{array} { l  } 
\text { Brand A  } &\text{Brand }\mathrm{B}& \text { Brand } \mathrm{C} &\text { Brand D }\\hline
15&20&21&15\25&17&22&15\21&22&20&14\23&23&19&23\22&&18&22\20&&&28\&&&28
\end{array}$

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