Question 1
At one vehicle inspection station, 13 of 52 trucks and 11 of 88 cars failed the emissions test. Assuming these vehicles were representative of the cars and trucks in that area, what is the standard error of the difference in the percentages of all cars and trucks that are not in compliance with air quality regulations?
◦ 0.032
◦ 0.070
◦ 0.049
◦ 0.095
◦ 0.025
Question 2
At one SAT test site students taking the test for a second time volunteered to inhale supplemental oxygen for 10 minutes before the test. In fact, some received oxygen, but others (randomly assigned) were given just normal air. Test results showed that 42 of 66 students who breathed oxygen improved their SAT scores, compared to only 35 of 63 students who did not get the oxygen. Which procedure should we use to see if there is evidence that breathing extra oxygen can help test-takers think more clearly?
◦ 2-sample
t-test
◦ 1-proportion
z-test
◦ matched pairs
t-test
◦ 2-proportion
z-test
◦ 1-sample
t-test
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