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Kindly provide the step by step solution with manual calculation ( no internet and website ) Question 9- In a large city, you pick a

Kindly provide the step by step solution with manual calculation ( no internet and website )

Question 9-

In a large city, you pick a sample of 30 of lawn mowings during summer.The standard deviationis known to be 11.4. The margin of error for a 90% confidence interval will be

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