SPRING 2011 COMPARING A SAMPLE STATISTIC TO POP PARAMETER

SPRING 2011 COMPARING A SAMPLE STATISTIC TO POP PARAMETER -...

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Unformatted text preview: COMPARING A SAMPLE STATISTIC (Mean) TO A POPULATION PARAMETER (Mean) This is when you draw a sample, calculate a mean for a variable, then want to compare that mean to some other value such as a known or stated national value or a population value. Exercise #1 in the back of Chapter 9 is a good example of this. National mean or = 13.5 National Standard deviation or = 7.6 N=150 = 10.9 =0.01 (alpha) IF WE ARE ASKING IF THERE IS SIMPLY A DIFFERENCE THE NULL AND RESEARCH HYPOTHESES ARE AS FOLLOWS AND YOU USE A TWO TAIL TEST : H :There is no difference between the national mean and the sample mean or = 13.5 H 1 :There is a difference between the national mean and the sample mean or 13.5 IF WE ARE ASKING IF THE SAMPLE MEAN IS LESS THAN THE POPULATION MEAN THE NULL AND RESEARCH HYPOTHESES ARE AS FOLLOWS AND YOU USE A ONE TAIL TEST : H :There is no difference between the national mean and the sample mean or = 13.5 H 1 :There is a difference between the national mean and the sample mean or...
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SPRING 2011 COMPARING A SAMPLE STATISTIC TO POP PARAMETER -...

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