Correlation-Regression Calculations Using VassarStats

Navigate the website in this order:

• Select Correlation & Regression from side menu
• From the next page under the heading Basic Linear Correlation and Regression
• Select Direct-Entry Version
• Enter sample size on the pop-up window
• Enter sample data into separate columns for X and Y
• Press “Calculate”
• Output you want consists of computed r, r², slope & y-intercept, p-value (two-tailed)

9.4

r = 0.634, slope = 0.031, y-int = 0.915, p-value = 0.0267, Reject H₀ at α = 5%

9.6

r = -0.219, slope = -0.991, y-int = 65.173, p-value = 0.6373, Accept H₀ at α = 5%

9.7

r = -0.879, slope = -0.604, y-int = 8.51, p-value = 0.0091, Reject H₀ at α = 5%

9.8

r = 0.791, slope = 0.721, y-int = 4.667, p-value = 0.0111, Reject H₀ at α = 5%

9.9

r = 0.997, slope = 10.857, y-int = 0.762, p-value < 0.0001, Reject H₀ at α = 1%

9.10

r = -0.904, slope = -4.145, y-int = 108.40, p-value = 0.002, Reject H₀ at α = 1%