14.9 Heart Attacks on Mondays Do you hate Mondays? Researchers from Germany have provided another reason for you: They concluded that the risk of a heart attack for a working person may be as much as 50% greater on Monday than on any other day.' The researchers kept track of heart attacks and coronary arrests over a period of five years among 330,000 people who lived near Augsburg, Germany. In an attempt to verify their claim, you survey 200 working people who had recently had heart attacks and record the day on which their heart attacks occurred:

Do the data present sufficient evidence to indicate that there is a difference in the incidence of heart attacks depending on the day of the week? Test using = 0.05.

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Day Observed Count Sunday 24 Monday 36 Tuesday 27 Wednesday 26 Thursday 32 Friday 26 Saturday 29