SOLUTION: Assume that a sample is used to estimate a population mean
μ
μ
. Find the 90% confidence interval for a sample of size 67 with a mean of 42.3 and a standard deviation of 14
Question 1198519: Assume that a sample is used to estimate a population mean
μ
μ
. Find the 90% confidence interval for a sample of size 67 with a mean of 42.3 and a standard deviation of 14.1. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places.
90% C.I. =
Answer should be obtained without any preliminary rounding. Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
= = 2.837 ( accurate to 3 decimal places)
42.3-2.837 < < 42.3 + 2.837
CI(39.463, 45.137)
= CI z = value
90% z =1.645
92% z = 1.751
95% z = 1.96
98% z = 2.326
99% z = 2.576