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# Expected value of sample mean

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A sample of n=100 scores is selected from a population with u= 80 with o= 20. on average how much error is expected between the sample mean and the population mean?
* 0.8 points
* 4 points
* 0.2 points
* 2 points

If random samples, each with n=4 scores, are selected from a normal population with u= 80 and o=36, what is the standard error for the distribution of sample means.
* 18
*9
* 36
*4

If all possible random samples with n= 36 scores are selected from a normal population with u= 80 and o= 18, and the mean is calculated of each sample, what is the average of all the sample means?
* 80
* 2
* cannot be determined from the information given
* 6

For a particular population a sample n=4 scores has an expected value of 10. for the same population a sample of n= 25 scores would have an expected value of
* 20
* 8
* 4
* 10