Educational Technology, Inc. sells software to provide guided homework problems for a statistics course. They would like to know if students who use the software score better on exams. A sample of students who used the software had the following exam scores: 86, 78, 66, 83, 84, 81, 84, 109, 65, and 102. Students who did not use the software had the following exam scores: 91, 71, 75, 76, 87, 79, 73, 76, 79, 78, 87, 90, 76, and 72. Assume the population standard deviations are not the same.

At the 0.10 significance level, can we conclude that there is a difference in the mean exam scores for the two groups of students?

A. Find the degrees of freedom for unequal variance test.(Use Excel to calculate the degree of freedom expressed as a whole number. Do not attempt a manual calculation and use the data file provided.)

B. State the decision rule for 0.10 significance level:H₀:₁=₂;H₁:₁₂.(Negative amounts should be indicated by a minus sign. Round your answers to 3 decimal places.)

C. Compute the value of the test statistic.(Round your answer to 2 decimal places.)

D. What is your decision regardingH₀?

• Do not rejectH_0:1=2
• RejectH_0:1=2