Confidence Intervals: Difference of Two Means Practice Test

Since 0 is not in the interval, there is a 90% probability that the computed sample difference will be between 120 and 340 mg/day in future samples.

There is a 90% chance that Diet A adults have sodium intake 120 to 340 mg/day higher than Diet B adults.

We are 90% confident that the true difference in mean sodium intake, $\mu_A-\mu_B$, is between 120 and 340 mg/day.

We are 90% confident that $\mu_B-\mu_A$ is between 120 and 340 mg/day.

Because the interval is positive, 90% of adults on Diet A consume between 120 and 340 mg/day more sodium than adults on Diet B.