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# Statistics - Variation and Standard Deviation

A population of scores has &#956; = 20 and &#963; = 5. If every score in the population is multiplied by 2, then the new values for the mean and standard deviation would be:

standard deviation = _______________

A sample of scores has M = 30 and s = 10. If 3 points are added to every score in the population, then the new values for the mean and standard deviation would be:

standard deviation = _______________

A developmental psychologist studies the number of words seven infants have learned at a particular age. Find the mean, SS, variance, and standard deviation of the number of words learned by this POPULATION of infants.

X f
--------------------
9 2
8 3
7 4
6 1
5 3
4 5
3 0
2 1
1 2
0 4

SS:_______________________

Variance:_______________________

Standard Deviation:_______________________

What would the standard deviation be if this were a sample?

#### Solution Summary

Complete, Neat and Step-by-step Solutions are provided. Also attached Excel file for Solution.

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