A population is estimated to have a standard deviation of 8. We want to estimate the population mean within2, with a 90% level of confidence

How large a sample is required (Round up your answer to the next whole number)

sample required is

zalpha for 90% level of confidence = 1.65

the standard deviation of sample mean = 8/sqrt(n)

(x-u) /{8/sqrt(n)} = 1.65

-1<|x-u|<1

sqrt(n)/8 = 1.65

n = 64*1.65^2 = 174.24 = 175

Secure Information

Content will be erased after question is completed.

Enter the email address associated with your account, and we will email you a link to reset your password.

Forgot your password?

Sign Up