please answer the following 2 questions

Q3 (5 points) A sample of size n is randomly selected from a normally distributed population with an unknown mean / and a known standard deviation o. Construct a (1 - o) 100% confidence interval for the unknown population mean /. + Drag and drop bur files or click to browse... Q4 (3 points) Discuss all possible alternatives that can reduce the width of the confidence interval constructed in part (c). Which alternative is the best? + Drag and drop your files or click to browse... Before you submit, please ensure that your pages are in order and rotated correctly. You will not be able to resubmit your work after the due date has passed. Time 13 Submit for evaluation