Find the minimum sample size n needed to estimate for the given values of c, , and E.90, =9.2,and E=2 Assume that a preliminary sample has at least...

1. Find the minimum sample size n needed to estimate μ for the given values of c, σ, and E.  c=0.90, σ=9.2,and E=2

Assume that a preliminary sample has at least 30 members .

n=

(Round up to the nearest whole number.)

2. Construct the confidence interval for the population mean μ. c=0.90, x overbar =15.6, σ=2.0, and n=35A 90% confidence interval for μ is (__,__) .,. (Round to one decimal place as needed.)