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Mathematics, 13.06.2021 06:00 jalayshiamartin
In a public opinion survey, 70 out of a sample of 100 high-income voters and 55 out of a sample of 80 low-income voters supported the introduction of a new national security tax.
a/ Estimate, with 95% confidence level, the true proportion of high-income people who will vote for the introduction of the tax.
b/ Can we conclude at the 5% level of significance that the proportion favoring the new security tax differs between high-income and low-income voters?
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