1. The local school district is comparing two methods for teaching mathematics to
third-grade children. One class of n1= 20 students is being taught by method A
and another class of n2= 20 is being taught by method B. At the end of the
school year, all of the students take a standardized math achievement test. The
scores for the students taught by method A produced a mean of X1 = 75 with sx1
= 9.73, and the students taught by method B had a mean of X2 = 87 with sx2 =
10.26. Do these data indicate a significant difference between methods at the .05
alpha level?
a. Identify the independent variables and the dependent variables.
b. Step 1: State the hypotheses.
c. Step 2: Set the criteria for a decision.
d. Step 3: Compute statistic.