Solution Found!
Consider the gain estimation problem in Exercise 8-4.(a)
Chapter 8, Problem 7E(choose chapter or problem)
Consider the gain estimation problem in Exercise 8-4.
(a) How large must n be if the length of the 95% CI is to be 40?
(b) How large must n be if the length of the 99% CI is to be 40?
Questions & Answers
QUESTION:
Consider the gain estimation problem in Exercise 8-4.
(a) How large must n be if the length of the 95% CI is to be 40?
(b) How large must n be if the length of the 99% CI is to be 40?
ANSWER:Step 1 of 2
Given that,
From Exercise 8-4,
A confidence interval estimate is desired for the gain in a circuit on a semiconductor device. Assume that gain is normally distributed with standard deviation s = 20.
(a)
It is required to compute n be if the length of the 95% CI is to be 40.
The 95% confidence level implies a 0.05 significance level.
Since the length of the confidence interval is twice the margin of error; therefore,
Therefore, the required sample size is 