There is an intelligence test with a known mean of 100 and standard deviation (

Mean = EX = add all scores, divide by N total number of scores 5 = standard deviation of sample X = square each score, add them, N divide by total number of scores, subtract squared mean, take square root of that answer S ST IN-1 = find s, divide s by the square root of the total number of scores minus 1 1 = page 367, a .05, df=N-1