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A consumer agency has retained an independent testing firm to examine a television manufacturer's claim that its 25-inch console model consumes just 110 watts of electricity. Based on a preliminary study, the population standard deviation has been estimated as 11.2 watts for these sets.
In undertaking a larger study, and using a simple random sample, how many sets must be tested for the firm to be 95% confident that its sample mean does not differ from the actual population mean by more than 3.0 watts?
Standard deviation of 1.8 years, and the distribution is approximately normal. if an employee is picked at random, what is the probability that the employee has worked at the store for over 10 years?
shortly after september 11th 2001 a researcher wanted to determine if the proportion of females that favored war with
Does age make a difference in the amount of savings a worker feels is needed to be secure at retirement? Suppose 210 workers in the 25-33 age category and 176 workers in the 34-52 age category were involved in this study.
the market price for a certain product is 5 per unit and occurs when 14000 units are produced. at at price of 1 no
Create a research question for one of the following groups: students, children or women. Include the independent and dependent variables you would study, an explanation of whether a one or two-tail test is most appropriate
Experience has shown a company that the cost of delivering a small package within 24 hours is $14.80. The company charges $15.50 for shipment but guarantees to refund the charge if delivery is not made within 24 hours.
a farmer wishes to determine the optimal level of a new fertilizer on his soybeancrop. some factors that affect crop
a tool-crib with one attendant serves a group of 10 mechanics. mechanics work for an exponentially distributed amount
a. What sample size would you recommend if an insurance agency wanted the sample mean to estimate the population mean within $25? b. What is the probability that the sample mean is within $100 of the population mean?
A new car salesperson knows that he sells cars to one customer out of 20 who enter the showroom. The probability that he will sell a car to exactly two of the next three customers is?
In terms of p , the researcher should test which of the following null and alternative hypotheses?
In each of the following situations, the sampling frame does not match the population, resulting in undercoverage. Give examples of population members that might have been omitted:
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