In a class of twenty-five 15-year old girls the average height is M = 62.60 inches. The national average for girls at this age is reported as follows: µ = 63.80 inches with a standard deviation, s = 2.66 inches.   1. What is the effect size Cohen’s d and what does it tell us about the effect?      2. Compute the z-statistic.

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In a class of twenty-five 15-year old girls the average height is M = 62.60 inches. The national average for girls at this age is reported as follows: µ = 63.80 inches with a standard deviation, s = 2.66 inches.

 

1. What is the effect size Cohen’s d and what does it tell us about the effect? 

 

 

2. Compute the z-statistic.

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