MathBench > Statistics

Bar Graphs and Standard Error

Review

For a scatterplot For a barchart
Choose x and y Same!
Label x, y, and give a title Same! (except x usually has no units)
Decide minimum and maximum values for x and y Only for y -- and include the error bars
Decide distance for ticks Only for y
Make a legend Same
Add data, using dots Use rectangles, not dots

Choosing between SD and SE

SD SE
Measures how far members of the population deviate from the average  Measures how far your estimate of the mean (from a sample) probably deviates from the population mean
Quantifies the population Quantifies your experiment
Does NOT depend on sample size DOES depend on sample size (a lot!)
Use to characterize the population Use to test your results

 

 

 

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