A random sample of 20 cbservations with a mean of 60 is selected from a normally distriatied population. Assume the oonulation.standard doviation is 21. 1. In developing ain) 95% confidence interval estimate for the population mean. detertuine the following volues: a) [00 not round ] Point Estimate = b) {2 decima 1 places 1 Significance level (a)= Round the critical value to two (2) decimal places and use the rounded value to calculate the remaining parts. c) [Enter a positive va lue] Critical value = d) [3 decimal places Standard Error of the Mean = e) [1 decimat place] Margin of Error = f) [1 decimal place ] Lower Confidence Limit = g) [1 decimal place] Upper Confidence Limit = 2. How large a sample is required to keep the margin of error within 4 units with 95% confidence? Report your answer as an integer. biopilation variance e" =729 The standaed ecrot of the mean is 4.117 . The conlicince intervais are neervai 1: 79.15