Math312 Fall 2022 HW02
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Math312
Fall 2022
HW02
1. (20 points) Do # 1-7,9,10 in the REVIEW EXERCISES of Ch08. Decide whether each of the following statements is true or false. If a statement is false, explain why.
2. (20 points) Comparison of confidence intervals on Normal mean u
(a) Given that the asymptotic distribution for the sample median, M of a random sample
drawn from a N(u, g2 ) population is
^n(M _ u) ~ N(0, g2 ), approximately/asymptotically
Use the Pivot method to derive and show that the 100(1 _ a)% asymptotic interval
estimator for u based on m is
m 士 z u g. (1)
(Hint: use T (u, X) = ~ N(0, 1) then use 1 _ a = P(-z < < z ) to start
the derivation)
(b) Recall the 100(1 _ a)% C.I. on u in using is
士 z g (2)
Comment on the difference between these two 100(1 _ a)% confidence intervals (the one in (1) and (2) in terms of the radius. Which is shorter?
(c) A sample of 49 observations is drawn from a N(u,25) population. The sample median is found to be m = 12.456 and the sample mean is = 11.050. Construct the 95% confidence intervals for u, (1) in using , (2) in using result in (a).
3. (30 points) #8.2.9.
4. (10 points) Redo part d. and f. in #8.2.9. by either SAS or R.
5. (20 points)#3.2.2 (pp.65)
2022-09-13