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

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.