March 23, 2009

What is meant by a parameter and a statistic?


Level of Significance

March 23, 2009

What is the difference between the P-value and the level of significance of a test?

Hypothesis Testing

March 23, 2009

What is a type I and type II error associated with hypothesis testing?


March 9, 2009

How 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, 2009

If 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, 2009

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

Central Limit Theorem

March 2, 2009

What 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, 2009

Give 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, 2009

What happens to the standard deviation of a sample mean distribution as n increases?

Standard Normal Distribution

February 23, 2009

Is 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?