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A university president believes that over the past few years the average age of students has increased. To test this hypothesis, an experiment is conducted in which the age of 150 randomly selected students is measured. Their mean age is 23.5 years. A complete census taken at the university a few years prior indicated a mean age of 22.4 years with a standard deviation of 7.6 years. Test the null hypothesis at the .05 level.
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What is your null hypothesis? What is your alternative hypothesis? What your decision about the null hypothesis?
Estimate the 95% confidence interval for the proportion of the electorate that support this policy.
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Discuss an example where you would use a test of hypothesis with three or more population means (that can be analyzed using ANOVA technique) at your employment or personal life.
A mean score of 600 and a standard deviation of 100. What credit score defines the top five percent of scores. Within what range would 85% of credit score fall.
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