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In a normal distribution cThe usual value that is chosen as the level of statistical significance in a research study is: A. 0.01 B. 0.05

In a normal distribution cThe usual value that is chosen as the level of statistical significance in a research study is: A. 0.01 B. 0.05 C. 0.1 D. 0.5urve, what percentage of the area under the curve is contained in the region between -2 and 2 standard deviations about the mean? A. 68.27% B. 95% C. 99.73% D. 95.45% E. 50%

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