If a distribution has a mean of 30 and a standard deviation of 3, then what is the z-score for a sample of 4 scores with a mean of 27?
Added by Jenna P.
Step 1
The standard error of the mean (SEM) is calculated by dividing the standard deviation by the square root of the sample size. SEM = standard deviation / √(sample size) In this case, the standard deviation is 3 and the sample size is 4. SEM = 3 / √4 = 3 / 2 = 1.5 Show more…
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