Sign up  |  Log in

T-test or Z-test

[question removed by moderator]

My question is how is it that variance is unknown when they state standard deviation as 10 million?

Top Instructors, Best-in-Class Content, Partner Until You Pass Guarantee

50 min in, he gives the explanation that because it’s testing one mean and is a small sample we use the T-test. Gives no mention about standard deviation.

The standard deviation for the sample is known, but not for the population.

Simplify the complicated side; don't complify the simplicated side.

Financial Exam Help 123: The place to get help for the CFA® exams