The commuting times (in minutes) of an employee for ten consecutive days are listed below. Find the median commute. 71 67 67 72 76 72 73 68 72 72
A) 72 minutes B) 67 minutes C) 71 minutes D) 73 minutes
Q. 2High temperatures in a certain city for the month of August follow a uniform distribution over the interval 63F to 90F. What is the probability that a randomly selected August day has a high temperature that exceeded 68F?
A) 0.8148 B) 0.1852 C) 0.4444 D) 0.037
Q. 3A survey claims that 9 out of 10 doctors (i.e., 90) recommend brand Z for their patients who have children.
To test this claim against the alternative that the actual proportion of doctors who recommend brand Z is less than 90, a random sample of 100 doctors results in 87 who indicate that they recommend brand Z. The test statistic in this problem is approximately (round to the nearest hundredth): A) -1.00 B) 1.00 C) -0.50 D) -0.66
Q. 4At Bill's community college, 49.2 of students are Caucasian and 4.1 of students are Caucasian math majors. What percentage of Caucasian students are math majors?
A) 8.3 B) 12.0 C) 45.1 D) 53.3
Q. 5The number of students enrolled in a physics class for the last ten semesters are listed below. Find the median number of students. 65 66 67 66 67 70 67 70 71 68
A) 67 students B) 66 students C) 68 students D) 70 students
Q. 6A jury is to be selected from a pool of 38 potential jurors. The defendant faces the death penalty if convicted. Of the potential jurors, 6 are opposed to the death penalty and would not convict regardless of the evidence.
The prosecutor knows that if even one juror opposes the death penalty, they will have no chance of getting a conviction. If none of the jurors opposes the death penalty they will have a chance of getting a conviction. What is the probability that none of the jurors opposes the death penalty, if the jury consists of 12 randomly selected jurors? A) 0.0834 B) 0.0876 C) 0.1272 D) 0.1208
Q. 7The business college computing center wants to determine the proportion of business students who have personal computers (PC's) at home. If the proportion exceeds 30, then the lab will scale back a proposed enlargement of its facilities.
Suppose 300 business students were randomly sampled and 65 have PC's at home. What assumptions are necessary for this test to be satisfied? A) No assumptions are necessary.
B) The sample variance equals the population variance.
C) The population has an approximately normal distribution.
D) The sample mean equals the population mean.
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