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A cement truck delivers mixed cement to a large construction site. Let X represent the cycle time in minutes for the truck to leave the construction site, go back to the cement plant, fill up, and return to the construction site with another load of cement. From past experiences, it is known that the mean cycle time is 41 minutes with a standard deviation of 13 minutes and that cycle times are normally distributed. What is the probability that the cycle time will exceed 48 minutes, given that it has exceeded 39 minutes?
At 0.05 level significance, is there evidence of the difference in proportion of dvds purchased on basis of the kind of media used (Mailing, E-Mail)?
question consider the following tableynbspnbspnbspnbspnbspnbsp 0nbspnbspnbspnbspnbspnbspnbspnbsp
Collect on its accounts receivable is 36 with a standard deviation of 11 days. What is the probability that a single AR account takes more than 30 days to collect?
perform a two sided hypothesis test to see if the mean is different from 32000 the curren mean sample size30 the sample
Then explain your answer to someone who has never had a course in statistics (but who is familiar with mean, standard deviation, and Z scores).
If Subway wanted to have 90% confidence in being within 3 percentage points of the population percentage who are pleased, how many of the new franchisees would have to be included in the sample?
If 1,000 of these tax returns are randomly selected, what is the approximate probability that between 110 and 140, inclusive, were prepared by H&R Block? Justify the use of the approximation you use, and make sure to define the random variable und..
Describe the steps of benchmarking relative to a company that develops microchips. What is the role of top management in this process?
(a) Does she need to do an experiment, or can she get by with observational study? (The latter would be much easier to do.) (b) If she can use observational data, what else would she have to assume, beyond the response schedule? (c) And, howwould she..
Construct appropriate control charts for before and after introduction of the new pathway. Discuss process stability and the results.
1. The Statistical Abstract of the United States published by the U.S. Census Bureau reports that the average annual consumption of fresh fruit per person is 99.9 pounds. The standard deviation of fresh fruit consumption is about 30 pounds.
Nestling mass and nest humidity. Researchers investigated the relationship between nestling mass, measured in grams, and nest humidity index, measured as the ratio of total mass of water in the nest divided by nest dry mass, for two different grou..
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