Asked by Vanessa

A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is 5.
a. What is the standard error of the mean (to 2 decimals)?
b. At 95% confidence, what is the margin of error (to 2 decimals)?

Answers

Answered by MathGuru
Part a)
SE of mean = sd/√n = 5/√40

Part b)
ME = 1.96 * 5/√40

I'll let you finish the calculations.


Answered by Anonymous
.80
Answered by MT
A) 0.79
B) 1.55
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