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PART A: LAB QUESTION L1. [Confidence interval (CI) for p:] Suppose we want to construct 100 confidence intervals (CIs) with confidence level (1 - a) 100% = 95% for the unknown population mean u of a normal distribution using the following steps: Step 1. Generate and store in columns c6-c30 100 random samples of size 25 each from the normal distribution with parameters p = 4, o = 7 as follows: random 100 c6-c30; normal 4 7. Step 2. Use columns c4 and c5 to store respectively the means and the standard deviations of the 100 samples you generated in Step 1 as follows: rmean c6-c30 c4 rstd c6-c30 c5 Step 3. Store the lower bound and the upper bound of your 95% CIs in c2 and c3 respectively by typing successively: let c2=c4-2.064*c5/5 let c3=c4+2.064*c5/5 Then create a column cl containing 1 or 0 according to whether the corresponding interval [c2, c3] covers u or not, by typing: let cl=(c2 =4) Finally sum up the entries of column cl to find how many CIs cover the value p = 4 by typing: tally cl (a) What is the percentage of confidence intervals that contain the true value / = 4? (b) How do you compare this percentage to the confidence level 95%