19584648-Null-Hypothesis-Statistics-ZTest-Significance

19584648-Null-Hypothesis-Statistics-ZTest-Significance -...

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[email protected] Statitics, Null Hypothesis, z-test, significance 009647504541577 Hypothesis Testing For a Population Mean The Idea of Hypothesis Testing Suppose we want to show that only children have an average higher cholesterol level than the national average. It is known that the mean cholesterol level for all Americans is 190 . Construct the relevant hypothesis test: H 0 : m = 190 H 1 : m > 190 We test 100 only children and find that x = 198 and suppose we know the population standard deviation s = 15. Do we have evidence to suggest that only children have an average higher cholesterol level than the national average? We have z is called the test statistic . Since z is so high, the probability that Ho is true is so small that we decide to reject H 0 and accept H 1 . Therefore, we can conclude that only children have a higher cholesterol level on the average then the national average.
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[email protected] Statitics, Null Hypothesis, z-test, significance 009647504541577
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This note was uploaded on 09/27/2009 for the course STATS 111 taught by Professor Al during the Spring '09 term at Tennessee Martin.

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19584648-Null-Hypothesis-Statistics-ZTest-Significance -...

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