Hands On Exercise 5
Question 1: Refer to the CHOLEST dataset
a) Calculate the 95% interval for the cholesterol levels for the individuals who did NOT have a
heart attack.
b) Calculate the 95% interval for the cholesterol levels for the individuals who were 2 days past
a heart attack.
Question 2: Refer to the CHOLEST Dataset
a) Calculate the 90% interval for the cholesterol difference between the measurements taken at 2
days after the attack and then 4 days after the attack. Is zero included in the interval? Why is
this important to know? Is the difference statistically significant? Why or Why not?
b) Calculate the 90% interval for the cholesterol difference between the measurements taken at 4
days after the attack and then 14 days after the attack. Compare these results to what you found
in a). Is the difference statistically significant? Why or Why not?
Question 3: Refer to the PennState3 Dataset
a) Calculate the 95% interval for the proportion of students who proclaim to believe in the
supernatural.
b) Calculate the 90% interval for the difference between males and females who proclaim to
believe in the supernatural. Is the proportional difference between the genders significant?
Why or Why not?
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STAT4030/8030 P R I E S T L E Y A N D H O G A N S O N