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

question 6

Essay

Test the claim that the samples come from populations with the same mean. Assume that the populations are normally distributed with the same variance.
-Random samples of four different models of cars were selected and the gas mileage of each car was measured. The results are shown below. $\begin{array}{llll}\text { Model A }&\text {Model B }&\text {Model C }&\text {Model D }\\\hline23 & 28 & 30 & 25 \\25 & 26 & 28 & 26 \\24 & 29 & 32 & 25 \\26 & 30 & 27 & 28\end{array}$ Test the claim that the four different models have the same population mean. Use a significance level of 0.05.

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