The Enormous State University Public Relations Department has issued a statement claiming that 80% of those...

The Enormous State University Public Relations Department has issued a statement claiming that 80% of those

who enroll at ESU graduate within 6 years. Being naturally skeptical, you decide to test their claim. You

interview 500 randomly selected people from the population that enrolled at ESU just over 6 years ago. Of

those 500, 360 have graduated.

a. What is the variable you are analyzing here? Of what sort is it? Who/what are the subjects?

b. What statistic can you compute from the sample?

c. Carefully write out the hypotheses for your test.

d. Run the test! Remember, if you use a normal approximation, you must justify it!

e. Give a “plain English” conclusion for your test.

f. If needed, give a 95% confidence interval for p, with an explanation. Remember the difference between CI and hypothesis testing calculations for

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