Fill in the blank?

l.) a.) Fill in the blank. A point estimate is a single number that is use estimate the value of an unknown b.) The best point estimate of the population mean u is a _______ . c.) The confidence interval is an interval that is used to estimate the value of a d.) The term za/2(On\\/On) is called e.) The confidence level is a percentage between 0% and 100% that measures the success rate of the method used to construct the confidence interval. If we were to draw many samples and use each one to construct a confidence interval, then in the long run, the percentage of confidence intervals that cover the true value would be equal to the f.) The length of the confidence interval is always equal to ["5", "6", "3", "2", "4"] times of the margin of error