# USU

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1. What is statistics
a tool that we use to make objective decisions from subjective data
2. Uses for stats
• represent data
• descriptive
• correlation
• inferential
3. Data
• info collected on subject
• usually numbers - height, weight, scores
• sometimes words or categories
4. Representation
graphs or charts
5. Descriptive
• Measures central tendency
• Measures variability
6. Measure of Central Tendency
• mean
• median
• mode
7. Measure of Variability
• range
• standard deviation
8. Mean
• aka average
• add points and divide by number of data points
9. Median
• Order data points from least to greatest
• median is middle
10. Mode
most frequently occuring data point in series
11. Range
difference between the least and greatest data point in series
12. Standard Deviation
tells how tightly all data points are clustered around mean in series of data. this is a measure of variability
13. data distribution
• mean weight of students at 2 different schools
• graph the data
14. Correlation
measure relationship between two varaibles cannot measure cause and effect
15. Inferential
allow us to test hypothesis in an experiment for cause and effect while comparing
16. null hypothesis
keeps bias out of experiement
17. t-test
used to determine if the means of two samples are significantly different
18. P value
• level of significance of test
• he probability that two samples are likely to have come from the same two underlying populations that have the same mean
 Author: Anonymous ID: 25236 Card Set: USU Updated: 2010-06-29 19:55:50 Tags: Statistics Folders: Description: Module 8 Show Answers: