Determine the sample size necessary to estimate for the following information. (a) = 20 and ME = 2.5 at 99% confidence (b)

Determine the sample size necessary to estimate μ for the following information.

(a) σ = 20 and ME = 2.5 at 99% confidence

(b) σ = 10.2 and ME= 1.5 at 95%confidence

(c) Values range from 60 to 460, error is to be within 15 and the confidence level is 99%

(d) Values range from 30 to 90, error is to be within 5 and the confidence level is 90%