90. Is the response rate for questionnaires affected by including some sort of incentive to respond along with the questionnaire? In one experiment, 110 questionnaires with no incentive resulted in 75 being returned, whereas 98 questionnaires that included a chance to win a lottery yielded 66 responses ( Charities, No; Lotteries, No; Cash,Yes, Public Opinion Q., 1996: 542—562). Does this data suggest that including an incentive increases the likelihood of a response?

State and test the relevant hypotheses at signi cance level .10 by using the P-value method.