In Order to Compare the Means of Two Populations, Independent

Essay

In order to compare the means of two populations, independent random samples of 144 observations are selected from each population with the following results. $\begin{array} { l l } \text {Sample 1}&\text {Sample 2}\\\bar { x } _ { 1 } = 7,123 & \bar { x } _ { 2 } = 6,957 \\s _ { 1 } = 175 & s _ { 2 } = 225\end{array}$ Use a 95% confidence interval to estimate the difference between the population means (μ1 - μ2). Interpret the confidence interval.