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# SCC 2007 Defusing Statistics

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• It’s time to cover what to do when we’re finally ready to take all that information we’ve gathered and do something with it. . .And this is where a lot of us start having second thoughts about this whole assessment thing. This means the dreaded S word—statistics. It’s enough to make ordinarily brave librarians quake in their sensible shoes. Since statistics can be a little overwhelming at times, we’re going to make this as simplistic and non-threatening as possible.
• ### SCC 2007 Defusing Statistics

1. 1. Defusing Statistics Tracey Minzenmayer SCC/MLA 2007
2. 2. The Basics <ul><li>Statistics is about </li></ul><ul><li>describing data </li></ul><ul><li>drawing conclusions based on the data </li></ul>
3. 3. Discrete & Continuous Variables <ul><li>A variable is something that CHANGES </li></ul>6 lb < 8 lb < 10 lb
4. 4. Assessment: Discrete & Continuous Variables <ul><li>Dog Breed : discrete or continuous? </li></ul><ul><li>Discrete </li></ul><ul><li>Length of Cat Whiskers : discrete or continuous? </li></ul><ul><li>Continuous </li></ul>
5. 5. Independent & Dependent Variables <ul><li>Independent Variables </li></ul><ul><li>Class size </li></ul><ul><li>Example or exercise </li></ul><ul><li>Length of class </li></ul><ul><li>Catnip or milk </li></ul>
6. 6. Independent & Dependent Variables <ul><li>Dependent Variables </li></ul><ul><li>Grade on final assignment </li></ul><ul><li>Choosing correct search terms </li></ul><ul><li>Confidence level </li></ul>
7. 7. The Normal Curve
8. 8. Over half the values are within one standard deviation of the mean
9. 9. Outlier- a value far away from the rest of the values
10. 10. Standard Deviation <ul><li>A measure of how closely together your values are clustered </li></ul>
11. 11. Different Standard Deviations
12. 12. Assessment: Variables & Standard Deviation <ul><li>Search example: Discrete or continuous? Independent or dependent? </li></ul><ul><li>Score on assignment: Discrete or continuous? Independent or dependent? </li></ul>
13. 13. Statistical Analysis <ul><li>Null hypothesis: I won’t find anything </li></ul><ul><li>Alternative hypothesis: There’s something in there! </li></ul>
14. 14. A Word About Trends. . .