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Risk taking is an important part of investing. In order to make suitable investment decisions on behalf of their customers, portfolio managers give a questionnaire to new customers to measure their desire to take financial risks. The scores on the questionnaire are approximately normally distributed with a mean of 50.5 and a standard deviation of 15 . The customers with scores in the bottom 10% are described as "risk averse." What is the questionnaire score that separates customers who are considered risk averse from those who are not? Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
Whose characteristics can be assume to be independent of each other, were examined. Let X denotes the number of defective computer chips.
What is the importance of the null hypothesis? Why has it been the backbone of mainstream hypothesis testing for decades? What are its limitations?
A recent article in the Arizone Republic indicated that the mean sellingprice of the homes in the area is more than $220,000. Can we conclude that the mean selling price in the Goodyear, AZ area is more than $220,000.
Ten students in a graduate program were randomly selected. Their grade point averages (GPAs) when they entered the program were between 3.5 and 4.0.
A nutritionist conducted an experiment on memory for dreams. She wanted to test whether it really was true that eating cheese before going to bed made you have bad dreams. Over three nights, the nutritionist fed people different foods before bed.
In a recent national survey, the mean weekly allowance for a nine-year-old child from his/her parents was reported to be $3.65. A random sample of 45 nine-year-olds in northwestern Ohio revealed the mean allowance to be $3.69 with a standard devia..
Perform a proper analysis. Describe your null and alternative hypothesis, report the p-value. What is your conclusion?
Suppose that the incident rate of a particulat kind of accient is 1/10,000 persons. In a town of 50,000 persons, what is the probability that there is no accident of this kind?
Critique the HR manager's planned approach and give him advice on how to proceed. You can assume that a reasonable estimate for the proportion of new hires that are happy with the company is .8.
Is there evidence of a difference in the median performance between the two methods? (Use x = 0. 05).
The times required to assemble a product are normally distributed with a mean of 47.5 minutes and a standard deviation equal to 8.5 minutes. What percent of the assembly workers require: (do not include % symbol)
A study regarding the relationship between age and the amount of pressure sales personnel feel in relation to their jobs revealed the following sample information.
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