Lieutenant Cho claims that his extra years of experience on the force make him better than the average cop at solving homicides, and he wants a big raise ($) because of it.

The average closure rate for all cops is 0.6.Cho closes 9 out of 10 homicide cases in a year so his closure rate is 0.9.Is he just lucky or is his true probability of closure for a case greater than 0.6?

We are going to do a hypothesis test and we are going to need to define if it was a "rare event." We give our probability of a "rare event" (ourAlpha) a prob = .01.

So, if the probability that Officer Cho would solve 9 out of 10 crimes (given that the true probability is .60), is .01 or less, we will reject our null hypothesis.

State your hypotheses and test the null hypothesis by using alpha of .01.

Note: The probability that Officer Chowould solve 9 out of 10 crimes (given that the true probability is 0.60), is 0.046