What is the equation of the least-squares regression line?
a. ŷ = –0.6442x + 22.94
b. ŷ = 22.94 + 0.5466x
c. ŷ = 22.94 + 2.866x
d. ŷ = 22.94 – 0.6442x
e. ŷ = –0.6442 + 0.5466x
- Given that the analysis is based on 10 datapoints, what is the P -value for the t -test of the
hypothesis H 0 : β = 0 versus H (^) A : β ≠ 0?
a. 0.02 < P < 0.03
b. 0.20 < P < 0.30
c. 0.01 < P < 0.05
d. 0.15 < P < 0.20
e. 0.10 < P < 0.15
“A hypothesis test yields a P -value of 0.20.” Which of the following best describes what is meant
by this statement?
a. The probability of getting a finding at least as extreme as that obtained by chance alone if the null
hypothesis is true is 0.20.
b. The probability of getting a finding as extreme as that obtained by chance alone from repeated
random sampling is 0.20.
c. The probability is 0.20 that our finding is significant.
d. The probability of getting this finding is 0.20.
e. The finding we got will occur less than 20% of the time in repeated trials of this hypothesis test.
- A random sample of 25 men and a separate random sample of 25 women are selected to answer
questions about attitudes toward abortion. The answers were categorized as “pro-life” or “pro-
choice.” Which of the following is the proper null hypothesis for this situation?
a. The variables “gender” and “attitude toward abortion” are related.
b. The proportion of “pro-life” men is the same as the proportion of “pro-life” women.
c. The proportion of “pro-life” men is related to the proportion of “pro-life” women.
d. The proportion of “pro-choice” men is the same as the proportion of “pro-life” women.
e. The variables “gender” and “attitude toward abortion” are independent. - A sports talk show asks people to call in and give their opinion of the officiating in the local
basketball team’s most recent loss. What will most likely be the typical reaction?
a. They will most likely feel that the officiating could have been better, but that it was the team’s
poor play, not the officiating, that was primarily responsible for the loss.
b. They would most likely call for the team to get some new players to replace the current ones.
c. The team probably wouldn’t have lost if the officials had been doing their job.
d. Because the team had been foul-plagued all year, the callers would most likely support the
officials.
e. They would support moving the team to another city. - A major polling organization wants to predict the outcome of an upcoming national election (in terms