An English teacher has been teaching a sixth grade composition class for many years. He has the feeling that over the past several years, the writing ability of students has changed. A national test of proficiency in composition was administered 5 years ago. The resulting distribution of scores was normally shaped, had a mean of 85 and a standard deviation of 10.9. In order to test his feeling, he gives his present class of 43 students the same proficiency test. The resulting mean is 80 and the standard deviation is 8.7. 
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Q103: Define ì null.
Q104: Explain why Q105: Define ì real. Q106: Define critical value(s) of a statistic. Q107: Explain the process of generating sampling distributions Q109: Define standard error of the mean. Q110: Define null-hypothesis population. Q111: If we are to use the statistic Q112: Define sampling distribution of the mean. Q113: Define critical region.
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