A 2
6.
A researcher conducted a study to investigate the relationship between the price of a video game (y) and the number of months after it has been released (x). The following regression equation was calculated: x
y
543
.
4
99
.
59
ˆ
±
. After 10 months, the actual price of the latest Call of Duty game is $39.99. What is the residual? A. 15.99 B. -4.543 C. -45.43 D. 45.43 E. None of these 7.
If P(A) = 0.30 and P(B) = 0.50, what is P(A or B) if A and B are disjoint? A.
0.80 B. 0.15 C. 0 D. 0.65 E. None of these 8.
Time magazine reported the results of a random sample of 800 adults contacted during the two days following a presidential election. According to the poll results, 56% reported that they had voted in the election. In statistical terms, what do we call the 56% figure? A. Population B. Parameter C. Sample D. Statistic 9.
The average daily maximum March temperatures are measured in Calgary and Montreal. Calgary has an average of 4°C with a standard deviation of 3°C. Montreal has an average of 1°C with a standard deviation of 6°C. During a cold snap Calgary has a high of -23°C and Montreal a high of -5°C. Assuming the daily maximum temperatures are normally distributed, which city has the 'colder snap'? A.
Calgary, because its z-score is farther below zero. B.
Montreal, because its z-score is farther below zero. C.
Calgary, because its z-score is closer to zero. D.
Montreal, because its z-score is closer to zero. E.
There is not enough information provided to answer this question. 10.
In a survey to estimate the level of overall public support in the United States for the proposal of equal pay and benefits for adjunct lecturers, a random sample of 5000 adults is selected but only 50 responded. The most significant bias introduced here is: A.
Non-response bias B.
Response bias C.
Undercoverage D.
There would not be any bias present in this survey. 11.
Officials at a metropolitan transit authority want to get input from people who use a certain bus route about a possible change in the schedule. They randomly poll 20 riders from each bus route. The type of sampling method used is: A.
Simple random sample B.
Stratified random sample C.
Cluster sample D.
Systematic sample O
O
C
R
O
