Defusing Statistics Tracey Minzenmayer SCC/MLA 2007
The Basics <ul><li>Statistics is about </li></ul><ul><li>describing data </li></ul><ul><li>drawing conclusions based on th...
Discrete & Continuous Variables <ul><li>A variable is something that  CHANGES </li></ul>6 lb  <  8 lb  <  10 lb
Assessment: Discrete &  Continuous Variables <ul><li>Dog Breed : discrete or continuous? </li></ul><ul><li>Discrete </li><...
Independent & Dependent Variables <ul><li>Independent Variables </li></ul><ul><li>Class size </li></ul><ul><li>Example or ...
Independent & Dependent Variables <ul><li>Dependent Variables </li></ul><ul><li>Grade on final assignment </li></ul><ul><l...
The Normal Curve
Over half the values are within one standard deviation of the mean
Outlier- a value far away from the  rest of the values
Standard Deviation <ul><li>A measure of how closely together your values are clustered </li></ul>
Different Standard Deviations
Assessment: Variables & Standard Deviation  <ul><li>Search example: Discrete or continuous? Independent or dependent? </li...
Statistical Analysis <ul><li>Null hypothesis: I won’t find anything </li></ul><ul><li>Alternative hypothesis: There’s some...
A Word About Trends. . .
Any Questions? Join us on Ning:  http://libassess.ning.com
Photo Credits <ul><li>http://commons.wikimedia.org </li></ul><ul><ul><li>Tim Bartel (slide 6) </li></ul></ul><ul><ul><li>J...
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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. . .
    15. 15. Any Questions? Join us on Ning: http://libassess.ning.com
    16. 16. Photo Credits <ul><li>http://commons.wikimedia.org </li></ul><ul><ul><li>Tim Bartel (slide 6) </li></ul></ul><ul><ul><li>Julian Cantarelli (slide 13) </li></ul></ul><ul><li>http://www.morguefile.com </li></ul><ul><ul><li>Tim Hansen (slide 9) </li></ul></ul><ul><ul><li>Michelle Kwajafa (slide 15) </li></ul></ul><ul><ul><li>Mary A. Pen (slide 8) </li></ul></ul><ul><ul><li>Gracey Stinson (slide 2) </li></ul></ul><ul><ul><li>Luis C. Tejo (slide 3, cat) </li></ul></ul><ul><ul><li>Dawn M. Turner (slides 8, 12) </li></ul></ul><ul><ul><li>Mary R. Vogt (slide 14, both dogs) </li></ul></ul><ul><ul><li>Stuart Whitmore (slide 3, cat on pumpkin) </li></ul></ul><ul><li>http://www.flickr.com </li></ul><ul><ul><li>Ryan Forsythe (slide 5) </li></ul></ul>

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