A state that requires periodic emission tests of cars operates two emission test stations, A and B,
Question:
a. What is the point estimate of the difference between the two population proportions?
b. Construct a 95% confidence interval for the difference between the two population proportions.
c. Testing at a 5% significance level, can you conclude that the two population proportions are different? Use both the critical-value and the p-value approaches.
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