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Asha owns a car-wash and is trying to decide whether or not to purchase a vending machine so customers can buy coffee while they wait.
Asha owns a car-wash and is trying to decide whether or not to purchase a vending machine so customers can buy coffee while they wait. She'll get the machine if she's convinced that more than 30\% of her customers would buy coffee. She plans on taking a random sample of customers and asking them whether or not they would buy coffee from the machine, and she'll then do a significance test using \alpha=0.05 to see if the sample proportion who say "yes" is significantly greater than 30\% . Suppose that in reality, it is actually 33\% of her customers that would buy coffee. Which of the changes below would result in the highest power for her test? Choose 1 answer: (Choice A) Increase the significance level to \alpha=0.10 and use a sample size of n=150 . . (Choice B) Increase the significance level to \alpha=0.10 and use a sample size of n=300 . . (Choice C) Decrease the significance level to \alpha=0.01 and use a sample size of n=150 . . (Choice D) Decrease the significance level to \alpha=0.01 and use a sample size of n=300
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