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An article in the National Geographic News ("U.S. Racking Up Huge Sleep Debt," February 24, 2005) argues that Americans are increasingly skimping on their sleep. A researcher in a small Midwestern town wants to estimate the mean weekday sleep time of its adult residents. He takes a random sample of 80 adult residents and records their weekday mean sleep time as 6.4 hours. Assume that the population standard deviation is fairly stable at 1.8 hours.
Calculate the lower bound of the 95% confidence interval for the population mean weekday sleep time of all adult residents of this Midwestern town. (Round intermediate calculations to 2 decimal places. Round the z-values and final answer to 2 decimal places.)
Determine the average number of farms per state from these data. The mean computedfrom the original ungrouped data was 41,796 and the standard deviation.
Time it took then to change a water pump was 18 minutes. The SD of the sample was 3. Find the 99% of the interval of the true mean.
A prominent social scientist describes the process of choosing a model specification as follows.
a. Estimate the model defined as Salary = ß0 + ß1 PCT + ß2TD + ß2Age + e. b. Are you surprised by the estimated coefficients?
Construct a 95% confidence interval for the mean µd of the population paired differences, where a paired difference is equal to the score of an employee.
(a) What Z value would be appropriate for a 98%service level? (b) What safety stock should Ross maintain if hewants a 98% service level? (c) What is the adjusted ROP for the brackets?
Assume that the weight loss for the first month of a diet program varies be- tween 6 pounds and 12 pounds, and is spread uniformly over the range of possibiliti
a test for marijuana was tried on 210 subjects who did not use marijuana. the test result was wrong 52 times.a. based
Assume that you are the owner of CDA Elevators a Large Regional Elevator Company that constructs and repairs elevators for new and existing construction. Assume further that you are trying to decide if you want to extend your business by adding an..
The data here are counts, so they are discrete, however, one might try to approximate the distribution with a continuous distribution. What distribution(s) might approximate the distribution of the data? What distribution(s) would not approximate..
Determine the probability mass function of the salesperson's November sales (in $). What is the probabiity that his sales for November will be less than 100k? Find the mean and standard deviation of the November sales.
Each morning, coffee is brewed in the school workroom by one of three faculty members, depending on who arrives first at work.
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