A university was interested in student reaction to a proposal to spend more on athletic scholarships and less on academic scholarships. 35 student athletes were surveyed. What type of problem has occurred?
A) selection bias B) measurement error C) nonresponse bias
Q. 2A watchdog group is investigating how people are treated during the foreclosure process. Surveys were mailed to a random sample of 300 people who had recently been threatened with foreclosure.
75 of the surveys were returned by the postal service because the intended recipients had moved and left no forwarding address. What type of problem has occurred?
A) measurement error B) nonresponse bias C) selection bias
Q. 3The table shows the number of each type of book found at an online auction site during a recent search. Suppose that Juanita randomly chose one book to bid on and then noted its type.
Type of Book Number
Children's 51,033
Fiction 141,114
Nonfiction 253,074
Educational 67,252
a. List the sample points for this experiment.
b. Find the probability of each sample point.
c. What is the probability that the book was nonfiction or educational?
Q. 4In an exit poll, 45 of voters said that the main issue affecting their choices of candidates was the economy, 35 said national security, and the remaining 20 were not sure.
Suppose we select one of the voters who participated in the exit poll at random and ask for the main issue affecting his or her choices of candidates.
a. List the sample points for this experiment.
b. Assign reasonable probabilities to the sample points.
c. Find the probability that the main issue affecting his or her choices was either the economy or national security.
Q. 5Which type of problem has occurred when inaccuracies exist in the values of the data recorded?
A) nonresponse bias B) selection bias C) measurement error
Q. 6The total points scored by a basketball team for each game during its last season have been summarized in the table below. Which statement following the table must be true?
Score Frequency
41-60 3
61-80 8
81-100 12
101-120 7
A) The range is at least 41 but at most 79. B) The range is at least 81 but at most 100.
C) The range is at least 41 but at most 120. D) The range is 79.
Q. 7What is meant by selection bias?
What will be an ideal response?
Q. 8The table displays the probabilities for each of the outcomes when three fair coins are tossed and the number of heads is counted. Find the probability that the number of heads on a single toss of the three coins is at most 2.
Outcome 0 1 2 3
Probability .125 .375 .375 .125
A) .875 B) .500 C) .750 D) .125
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