Unit 1 Practitioner’s Work

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Unit 1 Practitioner’s Work. Photo source: http://davidmlane.com/hyperstat/outlier.jpg. Unit 1 Scenario 1. Complete the course pretest. No need to study, just take the test. Descriptive statistics.  For more information: http://www.openepi.com/Menu/OpenEpiMenu.htm

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### Unit 1 Practitioner’s Work

Photo source: http://davidmlane.com/hyperstat/outlier.jpg

Unit 1 Practitioner's Work - Descriptive Statistics

Unit 1 Scenario 1
• Complete the course pretest. No need to study, just take the test.
• After some students took the pretest in one class, eCollege calculated descriptive statistics about the test.

Unit 1 Practitioner's Work - Descriptive Statistics

Descriptive statistics
• Descriptive statistics give us information that helps us interpret the data.
• In this case, we are not comparing this test with another test or this group with another group, we are just describing the behavior of this group (you also did the pretest).
• Voila, descriptive statistics.

Photo source: http://members.pioneer.net/~mchumor/00images/7203_statistics_cartoon.gif

Unit 1 Practitioner's Work - Descriptive Statistics

15

14

13, 13, 13, 13

12

11

Mean?

Median?

Mode?

Range?

Photo source: http://www.sarkisian.net/sc705/book.jpg

Unit 1 Practitioner's Work - Descriptive Statistics

Descriptive Statistics
• Highest Score: 15 (83%)
• Lowest Score: 11 (61%)
• Range: 4 (Lowest to highest score.)
• Mean: 13 pts. (Average)
• Median: 13 pts. (Midpoint)Mode: 13 pts.
• Number of Respondents: 8
• Points Possible: 18 pts.

Unit 1 Practitioner's Work - Descriptive Statistics

Imagine that we had 100 students take this pretest.
• A bunch of scores might fall in the middle, with very few scores at very high and very low 9-10 or 1-2.
• This creates a bell curve effect (see attachment).

Unit 1 Practitioner's Work - Descriptive Statistics

The SD deviation describes what the data looks like.
• M = mean or average. S or SD -1 would be one standard deviation below the mean, +1 would be one standard deviation above the mean, and so on.

Unit 1 Practitioner's Work - Descriptive Statistics

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Photo source: http://fc.bullis.org/~faith_Darling/FOV2-0001D744/S01105998-01105998.0/PieChartCartoon.gif

Unit 1 Practitioner's Work - Descriptive Statistics