Question

4. What is the difference between the null and alternative hypotheses? What does alpha

      represent? (4 pts)

The proportion of professional baseball players who take steroids has been assumed to be twenty percent by the team owner council. The Commissioner of Baseball has instituted a new campaign to reduce the proportion of players who take steroids. The Commissioner would now like to test whether their campaign has worked. (α = 0.05)

      State the null and alternative hypotheses that the Commissioner would test. Use

      symbols in the hypotheses. State alpha and define the parameter. (7 pts)

Ho: p = 0.2 (.)       

      Ha: p < 0.2 (.)                                

Time Magazine states that the nationwide drop out rate for high school seniors is ten percent. You conduct a test to see if the drop out rate for high school seniors is actually more than ten percent. ( α = 0.01)

     State the null and alternative hypotheses for this test. Use symbols in the hypotheses.

     State alpha and define the parameter. (7 pts)

The Maryland Department of Health claims that the proportion of heroin users in Maryland that have been infected by HIV is four percent. Suppose a researcher wants to show that this claim is not true. ( α = 0.1)

     State the null and alternative hypotheses to dispute the Maryland Department of

     Health’s claim. Use symbols in the hypotheses. State alpha and define the parameter.

    (7 pts)

Ho:        

      Ha:

Answer 1