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In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed...
In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6982 subjects randomly selected from an online group involved with ears. There were 1315 surveys returned. Use a 0.01 significance level to test the claim that the return rate is less than 20%. Use the P-value method and use the normal distribution as an approximation to the binomial distribution.
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