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Week 4 DQ 1
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State the criteria for choosing a t-test and a z-test. Then give an example of a problem in which you would use z-test to evaluate the data. Next, take the same example and modify it so that a t-test would be preferable. Explain why.
Week 4 DQ 2
In general terms:
· What is a null hypothesis?
· What is an alternative hypothesis?
Under American criminal jurisprudence, the accused is presumed innocent until proven guilty beyond the “shadow of a doubt.”
· What is the null hypothesis?
· What is the alternative hypothesis?
· Explain how the Type I and Type II errors apply to the court system.
· In court, what is the equivalent of the test statistic upon which the decision is based?
· In statistical terms, how would you define “shadow of a doubt?”
· In statistics, why should the decision always be stated in terms of the null hypothesis? (That is: reject the null hypothesis or fail to reject the null hypothesis.)
