In a public opinion survey, 80 out of a sample of 100 high-incomevoters and 55 out of a sample of 80 low-income voters supported the introduction of a newnational security tax.a/ Estimate, with 95% confidence level, the true proportion of low-income people who willvote for the introduction of the tax.b/ Can we conclude at the 5% level of significance that the proportion of high-income votersfavoring the new security tax is 10% higher than that of low-income voters?
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