Comparing the P-value to Alpha

Example. The coin guessing experiment

(Take a look at Figure 8.2!)

P value for 10 correct guesses = .001

P value for 9 and 10 correct guesses = .01 + . 001 = .011

P value for 8, 9, and 10 correct guesses = .044 + .01 + .001= .055

P value for 7, 8, 9, and 10 correct guesses = .117 + .044 + .01 + .001 = .172

P > .05

P < .05

Two-sided p-value

P value for number of guesses as extreme as 10

P value for number of guesses as extreme as 9

P value for number of guesses as extreme as 8

P value for number of guesses as extreme as 7