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Both, and show work please :) Question 7 1 pts What is the necessary sample size to construct a 90% confidence interval with an acceptable

Both, and show work please :)

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Question 7 1 pts What is the necessary sample size to construct a 90% confidence interval with an acceptable margin of error of 8 when the standard deviation for the random variables is 29? Question 8 1 pts What is the necessary sample size to construct a 95% confidence interval with an acceptable margin of error of 12 when the standard deviation for the random variables is 32? Question 9 1 pts

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