单选题
A local high school basketball team had 18 home games this season and
averaged 58 points per game. If we assume that the number of points made in home
games is normally distributed, which of the following is most likely the range
of points for a confidence interval of 90 percent?
- A. 26 to 80.
- B. 24 to 78.
- C. 34 to 82.
【正确答案】
C
【答案解析】This question has a bit of a trick ! To answer this question, remember that the mean is at the midpoint of the confidence interval. The correct confidence interval will have a midpoint of 58: (34+82)/2=58.