Question

A student wonders if people from small towns are friendlier than the general population. To test this hypothesis he gives 100 people a friendliness survey. The population mean for this survey is 50 with a standard deviation of 12. The mean for his sample is 52.5. Compute a z for a sample mean to determine if his hypothesis was supported. Use α = .05, one tailed. 1) Compute the effect size for this study. 2) Describe the size of the effect.

1.

a).03

b).21

c)1.2

d)2.08

2.

a) small

b) medium

c) large

Answer 1

From the given information,

z= (52.5-50)/(12/squareroot (100))

z=2.5/1.2

z=2.0833

And

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