Elena Lucin, a statistics student, collected the data in the table showing heart rate (beats per minute) for a random sample of coffee drinkers before and 15 minutes after they drank coffee. Carry out a complete analysis, using the techniques you learned in this chapter. Use a 5% significance level to test whether coffee increases heart rate. The same amount of caffeinated coffee was served to each person, and you may assume that conditions for a t-test hold.

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Before After 90 84 102 84 74 Before After 78 82 76 96 74 72 72 92 86 90 80 92 102 96 96 100 84 68 92 80 68 74