Suppose Jerry continues to serve and gets 60 out of 100 serves in. Use the One Proportion applet again to test if Jerry’s long-run proportion of getting his first serve in is greater than 50%. State the values you would enter into the applet.
a. Probability of heads _____________
b. Number of tosses _______________
c. Number of repetitions ____________
d. If Jerry’s long-run proportion of getting his new first serve in is truly 50%, is 60 out of 100 a likely value? Is it unlikely? How are you deciding?
e. Why do you suppose that you found different results in part (d) to this question as compared to part (d) of the previous question even though the sample statistic was 60% in both problems?

Jerry is a tennis player. He is working on a really tough first serve. While practicing his new tough serve, he gets 12 out of 20, or 60%, of his serves in. Jerry wants to know if his long-run proportion of getting his first serve in is greater than 50%.