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3. According to an IRS study, it takes a mean time of 290 minutes for taxpayers to prepare, copy and electronically transfer a 1040 tax form. The standard deviation of this distribution is 75 minutes. A consumer watchdog agency selects a random sample of 45 taxpayers for further study.A. What is the shape, mean(expected value), and standard deviation of the sampling distribution of the sample mean for samples of size 45?B. What is the probability that the sample mean is greater than 310 minutes?C. What is the probability that the sample mean is less than 5 hours?4. An airline wants to estimate the average number of unoccupied seats per flight. A random sample of 30 flights is selected and the mean number of unoccupied seats is 7.6. Assume that the population standard deviation of unoccupied seats is known to be 3.9. Compute and explain a 95% confidence interval estimate of the population mean number of unoccupied seats per flight.5. Two percent (.02) of the items produced by a machine are defective. A random sample of 55 items is selected and checked for defects. Use the normal approximation to the binomial to find:A) the probability that the sample will contain 4 or more defects?
Rosenberg Land Development (RLD) is a developer of condominium properties in the Southwest United States. RLD has recently acquired a 40.625 acre site outside of Phoenix, Arizona. Zoning restrictions allow at most 8 units per acre. Three types ..
Use a regression model with dummy variables as follows to develop an equation to account for seasonal effects in the data. Qtr1 = 1 if Quarter 1, 0 otherwise; Qtr2 = 1 if Quarter 2, 0 otherwise; Qtr3 = 1 if Quarter 3, 0 otherwise.
A local corporation was interested in the purchasing habits of Wake County residents.Specifically one of the things they were interested in was the proportions of residents that did a major home improvement project in the last year.
Describe what is meant by the statement that "the margin of error was given as ±1 percentage point." What confidence interval is USA Today talking about?
The ages (in years) of the employees at a particular computer store are 36, 32, 22, 32, 33 . Assuming that these ages constitute an entire population, find the standard deviation of the population. Round your answer to at least two decimal plac..
A randomly chosen individual makes 3 claims
Compute the mean median, and mode
Scenario: You are a healthcare administrator that is trying to introduce a change in practice to a group of stakeholders. Your goal is to help them understand the rationale and need for the change, and to get a sense of the areas of resistance to the..
A certain manufactured item is visually inspected by two different inspectors - What fraction of the defective items get by both inspectors
A large disaster cleaning company estimates that 30% of the jobs it bids on are finished within the bid time. Looking at a random sample of 8 jobs that it has contracted: calculate the mean number of jobs completed within the bid time. Find the proba..
A medical researcher wishes to estimate what proportion of babies born at a particular hospital are born by Caesarean section. In a random sample of 100 births at the hospital, 34% were Caesarean sections. Find the 95% confidence interval for ..
Epidemiology question set
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