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14. According to the National Health and Nutrition Examination Survey and the Epidemiologic Follow-up Study the...

14. According to the National Health and Nutrition Examination Survey and the Epidemiologic Follow-up Study the mean systolic blood pressure for individuals aged 25 to 59 is 127.3 with a standard deviation of 20.2. A sample measurement of systolic blood pressure from 15 EDUR 8131 Statistics students is taken to learn whether EDUR 8131 students have blood pressure that differs from the national average. (a) Perform a one sample Z test on these data to learn whether a difference in blood pressure exists • present calculated Z test value; • write a brief conclusion about your finding (4 points). (b) Construct a 95% confidence interval about the sample mean for these data (2 points).

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