SOLUTION: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately
σ
=
50.2
. You would l
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Probability-and-statistics
-> SOLUTION: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately
σ
=
50.2
. You would l
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Question 1197539: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately
σ
=
50.2
. You would like to be 90% confident that your estimate is within 1.5 of the true population mean. How large of a sample size is required?
n =
Hi
90% confident ⇒ z = 1.645 (See below)
σ = 50.2, ME = 1.5
How large of a sample size is required?
0r
n =
n = = 36.7 0r sample Size = 37 (always round Up)
= CI z = value
90% z =1.645 Invnorm(.95) 2-sided (.90 + .10/2 = .95 )
92% z = 1.751
95% z = 1.96
98% z = 2.326
99% z = 2.576
Wish You the Best in your Studies.
