The proportion of students who pass a placement exam at a college has been 0.64. With hopes to increase that proportion the college hired a company to provide a brief refresher class before the test...

The proportion of students who pass a placement exam at a college has been 0.64. With hopes to
increase that proportion the college hired a company to provide a brief refresher class before the test is given.
A sample of 250 students got selected for the study and 168 of these students passed the exam. At the 5%
significance level do the data provide enough evidence to claim the population proportion of students passing
the test will be higher with the company’s refresher class?

what is the hypthesis and test stastic?