Bo is buying some nails for a project. They are interested in whether the boxes are significantly lighter than advertised. The company says the box of nails should weigh 10 lbs but Bo finds the average weight of 8 boxes is     9.8 lbs with a standard deviation of .4 lbs. Assume an alpha of .10. What is the Cohen's d? What is the r2? The answer is in percentages.

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