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1. An investment analyst has data for the past 8 years on each of two mutual funds, with the annual rates of return for each listed in file XR11074. On average, each fund has had an excellent annual rate of return over the time period for his data, but the analyst is concerned that a mutual fund with greater variation in rate of return tends to involve greater risk for his investment clients. Using the 0.05 level in a nondirectional test, examine whether the two mutual funds have differed significantly in their performance variability.
Reminder: Be sure to refer to Figure 11.1 in selecting the testing procedure for an exercise. When either test can be applied to the same data, the unequal-variances t-test is preferable to the z-test- especially when doing the test with computer assistance.
2. Suspecting that television repair shops tend to charge women more than they do men, Emily discon- nected the speaker wire on her portable television and took it to a sample of 12 shops. She was given repair estimates that averaged $85, with a standard deviation of$28. Her friend John, taking the same set to another sam- ple of 9 shops, was provided with an average estimate of $65, with a standard deviation of $21. Assuming normal populations with equal standard deviations, use the 0.05 level in evaluating Emily's suspicion. Using the appropriate statistical table, what is the approximate p-value for this test?
The sameple you found that 114 of those adults sampled over the age of 24 smoke. Develop a 95% condience interval for the current porportion of adults over the age of 24 who smoke.
Suppose that Y has a continuous distribution with pdf f2, let Z=X+Y. Show that Z has a continuous distribution and find its pdf.
the following questions all focus on definitions and concepts. you can easily answer each of these questions without
The Agency for Healthcare Research and Quality reports that medical errors are responsible for injury in 1 out of every 25 hospital patients in the United States. These errors are tragic and expensive. Preventable health care-related errors cost t..
Ace Machine Works estimates that the probability its lathe tool is properly adjusted is 0.8. When the lathe is properly adjusted, there is a 0.9 probability that the parts produced pass inspection.
a health researcher is interested in determining whether or not the speed at which people walk is related to their
To determine the proportion of people in your town who are smokers, it has been decided to poll people at one of the following local spots
Which of the following represents a reasonable interpretation of the survey results? For those not reasonable, explain the ?aw.
If a time series is stationary without a linear trend or the seasonal component, which of the following forecasting methods may be suitable.
You wish to find out if negative relationship exists between amount of bottled water someone drinks and their water bill. Create a prediction model, if suitable.
Represent the data relating to the average travel times in a histogram and represent the data relating to the percentage of workers using public transportation in a stem and leaf plot.
For each of following data sets, select the most suitable response from choices below the table. A strong negative linear relation exists.
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