Confidence Intervals

[vanessajackydavis]

Thanks for your lessons. They're always helpful. But, it looks like others noticed the same error, the top line of scores has a mean of 80.5 rather than 78. For a person (like me) new to statistics, this small error can really confuse us. Might consider updating.

[andreafirth]

Nope the square root of 1000 is definitely not 10 and on your slide in which you calculate sample means the mean of the first four numbers does not at up to 78 it adds up to 80.5. There are one or two other errors in this presentation but otherwise some good information to be had from watching it.