Question: Two teaching methods and their effects on science test scores are being reviewed. A randomly selected group of students is taught in traditional lab sessions.

Two teaching methods and their effects on science test scores are being reviewed. A randomly selected group of students is taught in traditional lab sessions. A second randomly selected group of students is taught using interactive simulation software. The science test scores of the two groups are shown in the stem-and-leaf plot.

Traditional Lab,Interactive Software,

4 , 6

99887663210 ,70455778

98511100,8 003478899

20, 9139

Key: 0l9= 90traditional

9l1=91 interactive

a) What is the mean of the difference between the mean science test scores?

b) Calculate the standard error of the two samples.

c) What assumptions should be made to conduct the test?

d) At = 0.05, can you support the claim that the mean science test score is lower for students taught using the lab method than it is for students taught using the interactive simulation software? Assume the population variances are equal.

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