When you choose a greeting card, do you always look for a humorous card, or does it depend on the occasion? A comparison sponsored by two of the nation€™s leading manufacturers of greeting cards indicated a slight difference in the proportions of humorous designs made for three different occasions: Father€™s Day, Mother€™s Day, and Valentine€™s Day. To test the accuracy of their comparison, random samples of 500 greeting cards purchased at a local card store in the week prior to each holiday were entered into a computer database, and the results in the table were obtained. Do the data indicate that the proportions of humorous greeting cards vary for these three holidays?

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Holiday Percent Humorous Father's Day Mother's Day Valentine's Day 20 25 24