The National Assessment in Education Program 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 €œstatistically 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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Yes No 200 156 159 153 2150 1143 140 136 100 Grade 4 Grade 8 Grade 12