05. ScreenCast: Difference In Means

Note at the end diffs should be diff when building the interval.

In this video, you built a confidence interval for the difference of the average heights for coffee drinkers and non-coffee drinkers. The interval was built at a 95% confidence level, and since the difference did not contain zero, this suggested there was truly a difference in the average heights in the population of coffee drinkers as compared to non-coffee drinkers.

Specifically, we can be 95% confident that the difference in the average heights for coffee drinkers as compared to non-coffee drinkers was in the provided interval of 0.59 to 2.37 inches.

Notice the similarity of the wording to the last confidence interval you built. The highlighted portions signify the two parts that can change in your conclusions:

1. The confidence level.
2. The parameter you are capturing with your interval.