Assume that a sample is used to estimate a population proportion μ . Find the margin of error M. E. that corresponds to a sample of size 722 with a mean of 54.2 and a standard deviation of 13.1 at a confidence level of 90%.

Step-by-step explanation:

Since the sample size is quite large, we can use the z-distribution.

The margin of error is  given by

Where n is the sample size, s is the sample standard deviation and is the z-score corresponding to a 90% confidence level.

The z-score corresponding to a 90% confidence level is

Significance level = α = 1 - 0.90= 0.10/2 = 0.05

From the z-table at α = 0.05

z-score = 1.645

Therefore, the margin of error is 0.776.

the correct option is b

step-by-step explanation:

your answer is -9

step-by-step explanation: