A researcher finds a .40 correlation between the number of years a student has access to a computer and his or her attitude toward mathematics. The study used 20 subjects. The correlation is statistically significant at what level?
a. .05 c. .001
b. .01 d. None of these are true.
Question 2
A researcher finds a .40 correlation between the number of years a student has access to a computer and his or her attitude toward mathematics. The study used 20 subjects. What are the degrees of freedom in this case?
a. 39 c. 19
b. 38 d. 18
The skullcap from Trinil, Java is the type specimen for H. erectus and is about 900,000 years old.
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The Cs-131 nuclide has a half-life of 30. years. After 139 years, about 3.0 grams remain. The ...
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