61. The Internet. The NAEP report described in Exercise 59 compared science scores for students who had home Internet access with the scores of those who did not, as shown in the graph. They report that the differences are statistically significant.

a) Explain what “statistically significant” means in this context.

b) If their conclusion is incorrect, which type of error did the researchers commit?

c) Does this prove that using the Internet at home can improve a student’s performance in science?

d) What companies might be interested in this information?

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Mean Score 200 150 156 100 Yes 1 No 159 153 1143 140 136 Grade 4 Grade 8 Grade 12