# Expected value of sample mean

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

https://brainmass.com/statistics/probability/expected-value-sample-mean-584633

#### Solution Preview

1.

error between sample and population mean, e = o/sqrt(n) = ...

#### Solution Summary

A few problems of sample expected mean are solved here