Sample Mean

Also called “Sampling distribution of Sample Mean”.

Mean and Variance of Sample Means

Example

Solve:

Probability of sample mean exceeding a value

Refer to Khan academy: Example: Probability of sample mean exceeding a value

Example

Solve:

• The Sample Size is too small, which is hard to make the Sample Distribution normal.
• It didn’t tell the Parent Distribution’s shape, so there’s no way to tell if the Sample Distribution can match the parent shape as normal shape.