Answer the following questions below:

1. Describe the possible negative effects of proceeding directly to mine data that has not been preprocessed.

2. Explain why zip codes should be considered text variables rather than numeric.

3. What is an outlier? Why do we need to treat outliers carefully?

4. True or false: All things being equal, more information is almost always better.

5. Which of the four methods for handling missing data would tend to lead to an underestimate of the spread (e.g., standard deviation) of the variable? What are some benefits to this method?

6. Calculate the mean, median, and mode (in dollars)

(10,7,20,12,75,15,9,18,4,12,8,14)