An online retailer monitors the number of visitors to the homepage, and the number of them who actually make purchases. She wants to test two new versions of the homepage, and the following table shows the conversion rate (number of purchase divided by the number of visits) before and after the change.   Original page Modified page 1 Modified page 2 Number of visitors 2841 2297 2132 Number that purchase 77 107 90 Test whether the three versions have the same conversion rate.

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