Question

________ is a fundamental difference between the t statistic and a z-score

Answer 1

Explanation:

- The Z-score allows you to decide if your sample is different from the population mean. In order to use z, you must know four things:

• The population mean.
• The population standard deviation.
• The sample mean.
• The sample size.

- Usually in stats, you don’t know anything about a population, so instead of a Z score you use a T-Test with a T Statistic.

- The major difference between using a Z score and a T statistic is that you have to estimate the population standard deviation. The T test is also used if you have a small sample size (less than 30).