Question 1
Baldness and heart attacks A recent medical study observed a higher frequency of heart attacks among a group of bald men than among another group of men who were not bald. Based on a
P-value of 0.062 the researchers concluded there was some evidence that male baldness may be a risk factor for predicting heart attacks. Explain in context what their
P-value means.
Question 2
Which of the following will make a confidence interval narrower?
I. increase the confidence level.
II. take a larger sample.
III. take a smaller sample.
◦ I only
◦ I and III
◦ I and II
◦ III only
◦ II only