The average daily turnover of Ye Company's chain stores is 7,500, with a standard deviation of 2,000. The turnover is expected to decrease this year. 36 chain stores are randomly selected to calculate the average daily turnover of 6,800. Assuming the standard deviation remains unchanged,
(a) With a significant level of 5%, has the average daily turnover of the chain store decreased?(b) According (a), if the actual daily turnover is 7,000, what is the value of Type Il error ß ?(c) According (b). If a and ß are reduced to half of the original at the sametime, how much does the number of sample need to increase?
(a) With a significant level of 5%, has the average daily turnover of the chain store decreased?
(b) According (a), if the actual daily turnover is 7,000, what is the value of Type Il error ß ?
(c) According (b). If a and ß are reduced to half of the original at the same
time, how much does the number of sample need to increase?
The average daily turnover of Ye Company's chain stores is 7,500, with a standard deviation of 2,000. The turnover is ex
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