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A random sample of 32 observations with a mean of 75 is selected from a normally distributed population. Assume the population standard deviation is 23. 1. In developing a(n) 80% confidence interval estimate for the population mean, determine the following values: a) [Do not round ] Point Estimate = b) [2 decimal places ] Significance level (a) = Round the critical value to two (2) decimal places and use the rounded value to calculate parts d) to g). () [Enter a positive value] Critical value = d) [3 decimal places ] Standard Error of the Mean = e) [1 decimal place] Margin of Error = f) [1 decimal place] Lower Confidence Limit = 9) [1 decimal place] Upper Confidence Limit = 2. How large a sample is required to keep the margin of error within 2 units with 80% confidence? Report your answer as an integer