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Example 7.1 from Statistics, 7.1 The Central Limit Theorem for Sample Means (Averages)
b. Find the value that is two standard deviations above the expected value, 90, of the sample mean.
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
b. To find the value that is two standard deviations above the expected value 90, use the following formula
The value that is two standard deviations above the expected value is 96.
The standard error of the mean is = = 3. Recall that the standard error of the mean is a description of how far (on average) that the sample mean will be from the population mean in repeated simple random samples of size n.
How did it go?