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You need to calculate the required sample size for estimating a population mean. Your desired margin of error is 40 and a pilot sample of 30 items indicates a sample standard deviation of 900. Determine the required sample size if the confidence level is 90%.
A polling company obtains an alphabetical list of names of voters in a precinct. They select every 20th person from the list until a sample of 100 is obtained.
There are 5,000,000 Adults 25+ in Mtown. An advertiser buys a schedule on Channel 45: 20 spots in early news with an average A25+ quarter hour audience of 150,000, 25 spots in daytime with an average A25+ quarter hour audience of 200,000, and 10 s..
A random sample of 85 group leaders, supervisors, and similar personnel at General Motors revealed that, on the average, they spent 6.5 years on the job before being promoted.
Determine expected cell counts if null hypothesis is true and show them in a two-way table. Determine the chi-square() statistic?
The quality control engineer for a furniture manufacturer is interested in the mean amount of force necessary to produce cracks in stressed oak furniture.
What conclusions can you draw about the nature of the relationship between anxiety and exam performance?
11% needed to be serviced once, 5% twice, 4% three times, and none required more than three repairs. what are the expected no of repairs per year.
The random variable X has which of the following probability distributions and What is the probability that no student wins
Plasma glucose levels are used to determine the presence of diabetes. Suppose the mean in (plasma-glucose) concentration (mg/dL) in 35-44 year olds is 4.86 with standard deviation = 0.54.
A sample of 20 is taken, resulting in a mean of 16.45 and standard deviation of 3.59. Assume that x is normally distributed and used alpha of 0.5 to test hypotheses.
Assume that a 2005 poll of 1000 American voters found that 76% of Republicans favored ending the tax on dividend income, as did 42% of Democrats and 54% of Independents.
The Web-based company Oh Baby! Gifts has a goal of processing 95 percent of its orders on the same day they are received. If 485 out of the next 500 orders are processed on the same day
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