Question

( C L Value UL- 2 SIVUS 0/0 LUuence. 3. A confidence interval estimate is desired for the mean gain in a circuit on a semiconductor device. Assume that gain is normally distributed with a standard deviation of a - 20.

Answer 1

3)

As the population s.d is given we can use standard normal z table to estimate the sample sizes

Given s.d = 20

F)

Critical value z from z table for 95% confidence level is 1.96

Margin of error (MOE) = Z*S.D/√N

MOE = LENGTH/2 = 20

we need to find n

20 = 1.96*20/√n

N = 4

G)

Critical value z from z table for 99% confidence level is 2.58

20 = 2.58*20/√n

N = 7