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Since changing this statistics course to a new format I would like to be able to detect an increase of one letter grade (5 point increase) in the overall average of my students. The population mean grade is 78, with a standard deviation of 6 points. Determine the sample size needed to detect an increase of 5 points. Let ? = 0.02 and ? = 0.05 (10 points)
a) Write the null and alternative hypotheses
b) Draw the curves and label ? and ?
c) Calculate the sample size
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Calculate the z score for a raw score of 10 from the folowing scores:10,20,25,5,30. Based on your anser , approximately what percentile does the raw score of 10 represent?
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An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
Assume a business researcherwishes to test hypothesis that greater proportion of marketing managers keep track of such obligations.
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