Two-group comparison

Rossman/Chance Applet Collection

Simulating two groups

Press the Draw New Samples button to generate data for two samples. You want to test the following hypotheses:
H₀: μ₁ - μ₂ = 0
H_a: μ₁ - μ₂ ≠ 0
After viewing the data, enter a guess for the p-value (two-sample t-test) and press Check Guess.

Edit population parameters

Population information

μ₁ =	n₁ =
μ₂ =	n₂ =
σ =

Simulated Samples

Dotplots Boxplots

p-value guess:

Standardized statistic:
t-value =		, df =
p-value =

Sample sizes range from 5 to 15; Means range from 20 to 30; Difference in means ranges from 0 to 10; (common) Standard deviation ranges from 3 to 12.
Check the change parameter Edit population parameters box to change these settings/use sliders.
Thanks to Josh Tabor for inspiration on this applet design

Source	df	Sum Sq	Mean Sq	F	p-value
Groups
Error
Total