The distribution of scores on a standardized test is approximately Normal with standard deviation of σσ = 22. If a sample of 150 students had a mean score of x¯x¯ = 74.3, use this to find a 99% confidence interval for the mean score of all students on this test. We are 99% confident that the the mean score of students on this test was in the interval     What is the margin of error for your confidence interval? Margin of error =

MATLAB: An Introduction with Applications
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The distribution of scores on a standardized test is approximately Normal with standard deviation of σσ = 22. If a sample of 150 students had a mean score of x¯x¯ = 74.3, use this to find a 99% confidence interval for the mean score of all students on this test.

We are 99% confident that the the mean score of students on this test was in the interval

 

 

What is the margin of error for your confidence interval?

Margin of error = 

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