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A carpet manufacturer is studying differences between two of its major outlet stores. The company has decided to revise and improve its operations and response time to customer needs and is particularly interested in the time it takes customers to receive carpeting that was ordered from the plant. A sample of 41 delivery times for the most popular type of carpet for store A revealed an average delivery time 34.3 days with a standard deviation of 2.4 days. A similar sample of 31 delivery times for store B revealed an average of 43.7 days with a standard deviation of 3.1 days. At the .05 level of significance, is there evidence of a difference in variability in the shipping time between the two outlets? What decision should the carpet manufacturer make? Please provide step by step solution.
Twelve doctor's offices were given 3 lab inspections with the following results:
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It does not matter, when data are skewed mean and median are the same.
Does the data prove a significant difference in mean times?
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If you draw one ball from the urn what is the probability that it is blue or white?
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You listen to radio station for 1 hour, at arbitrarily selected time, and carefully observe that amount of advertising time is equal to 7 minutes. Compute z-score for this amount of advertising time.
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Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
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