Narcolepsy is a disease involving disturbances of the sleep-wake cycle. Members of the German Migraine and Headache Society studied the relationship between migraine headaches in 96 subjects diagnosed with narcolepsy and 96 healthy controls. Use the results in the table below to answer the following questions.

	Reported Migraine Headaches	Did Not Report Migraine Headaches
Narcoleptic Subjects	21	75
Healthy Controls	19	77

1. Calculate the incidence of migraine headaches among healthy controls. (2 points)

1. Calculate the incidence of migraine headaches among narcoleptic subjects. (2 points)

1. Calculate the Relative Risk for migraine headaches due to having been diagnosed with narcolepsy. (2 points)

1. Interpret your findings from question 3. (2 points)

1. Complete the following table with the expected frequencies. (2 points)

	Reported Migraine Headaches	Did Not Report Migraine Headaches
Narcoleptic Subjects
Healthy Controls

1. Suppose we wish to know if there is a significant difference (=0.05) in reported migraine headaches between the narcoleptic subjects and the healthy controls. Carry out a chi-square test in excel, report your p value and state your conclusion. (4 points).