Three firms carry inventories that differ in size. Firm A’s inventory contains 2000 items, firm B’s inventory contains 5000 items, and firm C’s inventory contains 10,000 items. The population standard deviation for the cost of the items in each firm’s inventory is σ =144. A statistical consultant recommends that each firm take a sample of 50 items from its inventory to provide statistically valid estimates of the average cost per item. Managers of the small firm state that because it has the smallest population, it should be able to make the estimate from a much smaller sample than that required by the larger firms. However, the consultant states that to obtain the same standard error and thus the same precision in the sample results, all firms should use the same sample size regardless of population size. 1. Using the finite population correction factor, compute the standard error for each of the three firms given a sample of size 50. 2. What is the probability that for each firm the sample mean x ̄will be within +/- 25 of the population mean μ? Comment on the analysis outcomes.
Three firms carry inventories that differ in size. Firm A’s inventory contains 2000
items, firm B’s inventory contains 5000 items, and firm C’s inventory contains 10,000
items. The population standard deviation for the cost of the items in each firm’s
inventory is σ =144. A statistical consultant recommends that each firm take a sample
of 50 items from its inventory to provide statistically valid estimates of the average
cost per item. Managers of the small firm state that because it has the smallest
population, it should be able to make the estimate from a much smaller sample than
that required by the larger firms. However, the consultant states that to obtain the
same standard error and thus the same precision in the sample results, all firms should
use the same sample size regardless of population size.
1. Using the finite population correction factor, compute the standard error for each
of the three firms given a sample of size 50.
2. What is the
of the population mean μ? Comment on the analysis outcomes.
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