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How do to identify the subjects who are closest to the cutoff for the upper 2.5% and 5% of the scores and the lower 2.5% and 5% of the scores when looking at the z-scores?
A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below.
Before the rush began for Christmas shopping, a department store had noted that the percentage of its customers who use the store's credit card, the percentage of those who use a major credit card, and the percentage of those who pay cash are the ..
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches?
The average buglary rate for a juisdiction has been 311 per year with a standard deviation of 50 what is the probability that next year the number of burglaries will be more than 350.
Identify the population and the sample: A survey of 787 small-business managers found that 72% are optimistic about the future of their company.
Consider the trash bag problem. Suppose that an independent laboratory has tested trash bags and has found that no 30-gallon bags that are currently on the market have a mean breaking strength of 50 pounds or more.
An oil co. is drilling some wells. the results are described as either a dry well or a producer well. Past experience suggests that 10% of exploratory wells are producer wells.
Use an alpha level of .01 and test the hypothesis that the two methods are producing the same mean.
A realtor took a random sample of records of sales of homes from the files maintained by the Albuquerque Board of Realtors.
Determine whether the given value is a statistic or a parameter. A researcher determines that 42.7% of all downtown office buildings have ventilation problems. Is this a statistic or a parameter; explain your answer.
Provide an example of an independent sample and or a related sample that might be appropriate for use in your organization.
Consider an acceptance-sampling scheme in which factory takes delivery of a batch of components if random sample of 400 components contains fewer than M defectives.
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