i. If we want to determine which treatment means differ, one method is confidence intervals. ii. If the confidence interval includes 0, there is a difference in the pair of treatment means.
iii. If both end points of a confidence interval are of the same sign, it indicates that the treatment means are not different.
A) (i), (ii), and (iii) are all correct statements.
B) (i) and (ii) are correct statements but not (iii).
C) (i) and (iii) are correct statements but not (ii).
D) (i) is a correct statement but not (ii) or (iii).
E) (i), (ii), and (iii) are all false statements.

Question

Quizplus · Accepted Answer

(i) is correct because confidence intervals can indeed be used to determine which treatment means differ by checking if the interval for the difference between treatments includes 0. (ii) is incorrect because if the confidence interval includes 0, it suggests there is no significant difference between the pair of treatment means. (iii) is incorrect because if both endpoints of a confidence interval are of the same sign, it actually suggests a significant difference exists, not that the treatment means are the same.

I If We Want to Determine Which Treatment Means Differ