SOLUTION: A population is estimated to have a standard deviation of 7. We want to estimate the population mean within 1, with a 98 percent level of confidence. How large a sample is

Question 923322: A population is estimated to have a standard deviation of 7. We want to estimate the population mean within 1, with a 98 percent level of confidence.

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

Sample required is? .
Thank you!!!
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
98 percent level of confidence
critical value z = 2.326
ME = 1 = 2.326(7/sqrt(n))
1 = 2.326(7/sqrt(n))
n = (2.326�7)^2 = 265
round Up to next whole number: 266
..........
= CI z = value
90% z =1.645
92% z = 1.751
95% z = 1.96
98% z = 2.326
99% z = 2.576

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