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MAT 300 Stats Problem Set #10a
1. Test Z is a standardized test that all high school seniors take. The mean test score for a random
sample of 30 students who take the test is 75.7. The population standard deviation is 12. A high
school counselor hypothesizes that the mean score on Test Z for all high school seniors would be
70. Determine whether or not the results above support the counselor’s hypothesis. More
