CHAPTER 5
Overview
Which of the following would not be considered a quantitative variable?
(A) Heights of students in inches
(B) Intensity of sounds measured in decibels
(C) Numbers of students in various classrooms during the first class period
(D) Zip codes for various locations in your state
(E) Proportions of students in each class that have blue eyes
Which of the following is a parameter?
(A) The proportion of voters surveyed who favor Candidate A in the upcoming election
(B) The mean amount of television watched per day by all U.S. teens
(C) The proportion of subjects in a medical study that were cured in the group that received the
medication
(D) The difference in the proportion of subjects cured who received the medication and the
proportion of subjects cured who received the placebo
(E) The number of people in a sample who say they always wear their seatbelt when in a car
Of the following, which is NOT a random variable?
(A) The average number of children per family in the United States
(B) The number of children in a randomly selected U.S. household
(C) The speed of the next car to drive past your house
(D) The average gas mileage of the next car to drive past your house
(E) The sum of the numbers showing on the next roll of two dice
- A cable news show asks viewers to call in to indicate whether they agree with a particular policy.
The proportion of Americans who agree will be reported at the end of the show. Which of these is
NOT true about this situation?
(A) The fact that viewers of the cable news show may have similar opinions introduces bias into the
estimate of the proportion of Americans who agree.
(B) The fact that those with strong opinions are more likely to call in introduces bias into the
estimate of the proportion of Americans who agree.
