1. Event A occurs with probability 0.2. Event B occurs with probability 0.8. If A and B are disjoint (mutually
a) P(A and B) = 0.16. b) P(A or B) = 1.0. c) P(A and B) = 1.0. d) P(A or B) = 0.16.
2. A researcher states that the time it takes an adult to complete a certain paper and pencil maze is negatively associated
with age. This means
a) above average values of age tend to accompany above average values of time to complete the maze.
b) below average values of age tend to accompany below average values of time to complete the maze.
c) below average values of age can be accompanied by either above or below average values of time to complete
d) above average values of age tend to accompany below average values of time to complete the maze.
Use the following to answer question 3:
A television station is interested in predicting whether voters in its listening area are in favour of federal funding for
abortions. It asks its viewers to phone in and indicate whether they support or are opposed to this. Of the 2241
viewers who phoned in, 1574 (70.24%) were opposed to federal funding for abortions.
3. The sample is
a) all viewers listening to the show. c) the 1574 viewers who are opposed.
b) the 2241 viewers who phoned in. d) the 667 viewers who are in favour.
4. The one-sample t statistic from a sample of n = 19 observations for the two-sided test of
H0: µ = 6, Ha: µ ≠ 6
has the value t = 1.93. Based on this information
a) we would reject the null hypothesis at α = 0.10.
b) 0.025 < P-value < 0.05.
c) we would reject the null hypothesis at α = 0.05.
d) All of the above.
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