00- Statistical Analysis

Standard Deviation

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What is standard deviation?

How do I calculate standard deviation & what do those numbers mean?

http://www.mathsisfun.com/data/standard-deviation.html

 

Video Working Through Several Examples:

http://study.com/academy/lesson/data-analysis-standard-deviation.html

 

Course help sheet- Plant Example:

 

How to calculate mean, median, standard deviation etc. in Google sheets:

https://www.youtube.com/watch?v=QLlrPNOmyCQ

 

How to insert error bars in Google Sheets:

***WAIT!  This may not work on the new Google update- Try clearing the checkboxes in chart editor and selecting only “switch rows / columns” to create different series.  This way you can add unique error bars for each series.

Those Pesky Error Bars!: (Courtesy of Crystal)

• In Excel: Double click on a single data point to select that point, change that point to its own series / color
• Click format data series
• Custom
• Specify Value
• list all of the standard deviations

 

 

Regression Analysis

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• Sample Data Sets 
• Instructional PowerPoint: Regression analysis
• Statistical Test for Correlation:
  • You Tube
  • Pearson’s Correlation Table (2-Tailed)

 

Bi- and Multivariate Inferential Statistical Tests Differences of Groups

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• Chi Squared & T-test are two multivariate statistical tests we consider.

 

Chi Squared Test for Independence

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• Compares observed frequencies to expected frequencies
• ex: Is the distribution of sex and voting behavior due to chance or is there a difference between the sexes on voting behavior?
• How to: Chi Squared Test

 

T-Test

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• looks at differences between two groups on some variable of interest
• the IV must have only two groups (male/female, undergrad/grad) – though multiple t-tests can be performed
• ex: Do males and females differ in the amount of hours they spend shopping in a given month?
• T-Test Instructional Example: Bean Germination Lab with T-Test – Good
• T-Test PowerPoint :T-test[1]