Question

1)In a test for the difference between two proportions, the sample sizes were n1 = 79 andn2 = 89, and the numbers of events were x1 = 51 and x2 = 38. A test is made of thehypothesis H0: p1 = p2 versus H1: p1p2.Compute the value of the test statistic.1)A)2.83B)3.07C)2.94D)2.91

2)In a random sample of 310 cars driven at low altitudes, 41 of them exceeded a standardof 10 grams of particulate pollution per gallon of fuel consumed. In an independentrandom sample of 95 cars driven at high altitudes, 21 of them exceeded the standard.Compute the test statistic for testing if the proportion of high-altitude vehicles exceedingthe standard is greater than the proportion of low-altitude vehicles exceeding thestandard.2)A)-0.13B)-2.10C)-4.43D)2.1

3)A study reported that in a sample of 93 men, 23 had elevated total cholesterol levels(more than 200 milligrams per deciliter). In a sample of 104 women, 21 had elevatedcholesterol levels.Can you conclude that the proportion of people with elevated cholesterol levels differsbetweenmen and women? Use the Į = 0.01 level of significance.3)A)NoB)Yes

Answer 1