answer the following concept questions in 1-3 sentences each. (a) is a sample mean likely to be exactly equal to the population mean? explain why or why not. (b) will the sample mean (or sample proportion) always be inside a confidence interval for the population mean (or the population proportion)? explain why or why not. (c) suppose you have one dataset. you create two different confidence intervals from it, a 91.6% confidence interval, and a 97.8% confidence interval. which interval will be wider?