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Past experience shows that the standard deviation of the yearly income of textile workers in a certain state is $400. How many textile workers would you need to sample if you wished to estimate the population mean to within $50.00, with probability .95?
What are the main differences between descriptive and inferential statistics? Give examples of each. When would random sampling not be the best approach to sample selection? Give an example.
a researcher is examining preferences among four new flavors of ice cream. a sample of n 80 people is obtained. each
the average age of vehicles registered in the united states is 96 months. assume the population is normally
a company is studying the number of monthly absences among its 125 employees. the following probability distribution
Health and Nutrition Examination Survey, suppose that weights of men now are normally distributed with mean of m =172 pounds and standard deviation of s = 29 pounds.
a social worker is interested in estimating the average length of time spent outside of prison for first offenders who
A contractor developed a multiplicative time series model to predict the number of contracts in future quarters, using quarterly data on number of contracts during the 3-year period from 1996 to 1998.
Choose the appropriate statistical procedure: an analysis examining how cholesterol (mg/dL) varies with weight (lbs), annual income ($), and height (inches).
Research question : At α = . 05, is cockpit noise level independent of flight phase?
Determine the probability that person selected has blood type O? Given that person selected is a male, determine the probability that their blood type is AB?
Employees flexible scheduling? What is the p-value for this test?
Choose, at random, a direction which will keep you on dry land, and walk 1 km in that direction. Let P denote your position. What is the expected distance from P to the river?
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