52.0 68.0 52.0 68.0 (a) How many of the 75% confidence intervals constructed from the 20 samples contain the population mean, =60? (b) How many of the 95% confidence intervals constructed from the 20 samples contain the population mean, =60? (c) Choose ALL that are true. All of the 95% confidence intervals should be the same as each other. Since they are not all the same, there must have been errors due to rounding. We would expect to find more 95% confidence intervals that contain the population mean than 75% confidence intervals that contain the population mean. Given a sample, a higher confidence level results in a wider interval. The center of the 75% confidence interval for Sample 1 is 60, because the center of any confidence interval for the population mean must be the population mean. It is not surprising that some 75% confidence intervals are different from other 75% confidence intervals. Each confidence interval depends on its sample, and different samples may give different confidence intervals. None of the choices above are true.