Can Telling a Joke Affect Whether or Not a Customer

Short Answer

Can telling a joke affect whether or not a customer in a coffee bar leaves a tip for the waiter? A study investigated this question at a coffee bar in France. The waiter randomly assigned coffee-ordering customers into three groups: one received a card telling a joke with their bill, another group received a card containing an advertisement for a local restaurant, and the third received no card. The results are shown below.
-Use the Multiple Proportions applet to calculate the chi-square statistic and theory-based p-value for these data.
Chi-square statistic =
p-value =