# Statistics Ch 14

The flashcards below were created by user firefly501 on FreezingBlue Flashcards.

1. Margin of error
• The confidence level C determines the value of z* (in Table C).
• The margin of error also depends on z*.

• Higher confidence C implies a larger margin of error m (thus less precision in our estimates).

A lower confidence level C produces a smaller margin of error m (thus better precision in our estimates).

2. Impact of sample size
• The spread in the sampling distribution of the mean is a function of the number of individuals
• per sample.

The larger the sample size, the smaller the standard deviation (spread) of the sample mean distribution.

But the spread only decreases at a rate equal to √n.
3. Sample size and experimental design
4. The Power of a statistical test
• the probability that the test will reject Ho at a significance
• level α when Ha is true.
5. Type I error
Ho is rejected when it is actually true
6. Type II error
Failure to reject Ho when in fact Ha is true
 Author: firefly501 ID: 137618 Card Set: Statistics Ch 14 Updated: 2012-02-25 18:17:20 Tags: statistics Folders: Description: Thinking about Inference Show Answers: