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Means, standard errors, expected values

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For a population with u=80 and o=20, the distribution of sample means based on n=16 will have expected value of _____ and a standard error of ____.
* 80; 1.25 (this is the one i had chosen at 1st?)
* 80; 5
* 5; 80
* 20; 20

Samples of n=16 scores are selected from a population. If the distribution of sample means has an expected value of 40 and a standard error of 2, what are the mean and standard deviation for the population?

* u=40 and o=32
* u= 40 and o= 8
* u= 160 and o=2
* u=40 and o=2 (this is the one i had 1st chosen??)

A sample of n=4 scores is selected from a population with u=40 and o=8 and the sample mean is M=43. What is the sample error for the sample mean?
*3
*4 (is this correct?)
*8
*2

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Solution Summary

3 problems related to standard error are solved here.

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1. Expected value = mean = 80
Standard error = o/sqrt(n) = 20/sqrt(16) = 20/4 = ...

Solution provided by:
Amrit Lal Ahuja, PhD (IP)
Education
  • BEng, Allahabad University, India
  • MSc , Pune University, India
  • PhD (IP), Pune University, India
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