The random sample shown below was selected from a normal distribution. 3,3,3,9,10,8 a. Construct a 95% confidence interval for the population mean µ. b. Assume that sample mean x? and sample standard deviation s remain exactly the same as those you just calculated but that are based on a sample of n=25 observations. Repeat part a. what is the effect of increasing the sample size on the width of the confidence intervals.

Guest Jun 20, 2015