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'7. A consulting rm was asked to help determine if including an incentive can inuence the proportion of questionnaires returned from surveys. The company sends out 530 questionnaires. 170 include a promise to send respondents a summary of the survey results (50 of these are returned); 255 indicate that 10 randomly selected respondents will receive a gift (75 of these are returned); 105 have no incentives (20 of these are returned). Find the observed an expected frequencies required in order to perform a chi-square test. [3 pts.] NOTE: You are NOT actually performing a hypothesis test