Assume that the average annual income of workers in a region follows the normal distribution with mean u and variance 60

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Assume That The Average Annual Income Of Workers In A Region Follows The Normal Distribution With Mean U And Variance 60 1 (38.86 KiB) Viewed 23 times

Assume that the average annual income of workers in a region follows the normal distribution with mean u and variance 602 (unit is 10 thousands yen). We want to extract n workers from this area by random sampling and estimate the value of u from their average annual income. Answer the following questions. How many workers n is required in order to keep the estimation error within 30 (10 thousands yen) with the probability 0.95? Round up the first decimal place and fill in the answer as an integer. (Fill in the number only, do not write unit.) 答: How many workers n is required in order to keep the estimation error within 30 (10 thousands yen) with the probability 0.99. Round up the first decimal place and fill in the answer as an integer. (Fill in the number only, do not write unit.) 答: How many workers n is required in order to keep the estimation error within 5 (10 thousand yen) with the probability 0.99? Round up the first decimal place and fill in the answer as an integer. (Fill in the number only, do not write unit.) 答: