What is the z-score of a sample with n-size of 144 and a mean of 11 [Archive]

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lenw21

Nov 29, 2009, 06:32 PM

Hello, I am trying to solve this problem for my statistics homework.. I am stuck.. HELP!

What is the z-score of a sample with n-size of 144 and a mean of 11;
Standard Dev: 4

Unknown008

Dec 1, 2009, 08:05 AM

Somebody correct me if I'm wrong.

Use the formula:

z = \frac{x - \mu}{\sigma}

morgaine300

Dec 9, 2009, 02:13 AM

The equation is correct, but there is no z-score for what OP posted. A z score is how many standard deviations something is away from the mean. The mean is 11, but there is no "something." That is, the z-score of WHAT?