What is meant by a parameter and a statistic?

## Terminology

March 23, 2009## Level of Significance

March 23, 2009What is the difference between the P-value and the level of significance of a test?

## Hypothesis Testing

March 23, 2009What is a type I and type II error associated with hypothesis testing?

## Estimation

March 9, 2009How do you estimate the expected value of a random variable? What assumptions are needed? How much confidence should be placed in such estimates?

## Sample Size

March 9, 2009If you start out in the beginning design stage of a statistical project, how large a sample size should you plan to get?

## Confidence Interval

March 9, 2009Describe how confidence intervals for means use the central limit theorem or Student’s* t* distribution in their basic construction.

## Central Limit Theorem

March 2, 2009What is the “Central Limit Theorem”? Give a variable from everyday life for which you expect the variable *x* itself does **not** follow a normal or bell-shaped distribution.

## Standard Deviation

March 2, 2009Give a brief explanation as to why a large standard deviation will usually result in poor statistical predictions, whereas a small standard deviation usually results in much better predictions.

## Sampling Distributions

March 2, 2009What happens to the standard deviation of a sample mean distribution as n increases?

## Standard Normal Distribution

February 23, 2009Is there any area in the extreme tails of a standard normal distribution?How would you treat any area to the left of a z value smaller than – 3.49? How would you treat any area to the left of a z value greater than 3.49?