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Interval for the difference of the population

John wants to compare two means. His sample statistics were Picture and Picture. Assuming equal variances, the 95 percent confidence interval for the difference of the population means is approximately: [2.44, 6.19]. [1.17, 5.08]. [0.08, 4.32]. [-0.09, 3.19].

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## Q : They find that the length of calls

The bailey agency is studying long distance calls made from there office. They find that the length of calls follows a normal distribution, with a mean of 4.2 minutes and a standard deviation of 0.60 minutes.