Ken Blake, Ph.D.

Comparing a variable's average with an average you've specified: The one-sample t-test.

U.S. residents watch a lot of television. On average, it's presently about 293 minutes a day, or nearly five hours. That's more than residents of many other countries. So, what about, say, residents of Sweden? Imagine you carefully observe the TV viewing habits of 15 randomly selected Swedes to learn how many minutes each spends watching TV per day. When you do, you find that your 15 Swedes watch, on average, a lot less than the average for U.S. residents.

This video shows you how to use a t-test to learn whether the average television viewing time among your 15 Swedes was and whether it indicates that all Swedes watch, on average, less than than Americans do. It also shows you how to estimate, based on your sample of 15 random Swedes, how many minutes all Swedes spend on average per day watching TV.

Ready to practice what you saw in the video? Here's the dataset.