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The General Social Survey has a survey question: “Would you be willing to pay much higher...

The General Social Survey has a survey question: “Would you be willing to pay much higher taxes in order to protect the environment?” To test whether there is a difference between this year’s “Yes” rate and last year’s “Yes” rate, a sample of 500 people this year (Group 1) and 500 people last year (Group 2) were selected. Results show that 245 people said “Yes” this year and 225 people said “Yes” last year. Assume α=0.05.

What is the test statistic and rejection region?

What is the 95% confidence interval for the difference in “Yes” rate between this year and last year?

math   Statistics-And-Probability   
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