1. Name and distinguish between the three measures of central tendency.

2. a. Briefly explain the relationship between the standard deviation and the normal distribution. One way to do this is to discuss the probability associated with particular ranges of a normal random variable (in terms of standard deviations).

b. Briefly describe how the z-score "normalizes" or "standardizes" a variable.

3. Distinguish between the standard deviation and the standard error (standard deviation of the mean). You should answer with both an equation relating the two and in words explaining the variability of sample means as opposed to the variability of the original data.

4. Briefly describe the three general properties of a data set of ordered pairs (x,y) that are explained by the Pearson correlation coefficient, r.

5. Briefly describe the 95% confidence interval of the mean.

6. Explain the four main assumptions of linear regression.