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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?
It was reported that approximately 45% of all university professors are extroverted. Suppose you have classes with 6 different professors. What is the probability that all 6 are extroverts?
Based on the custom "rule-of-thumb" for estimating the standard deviation, if the range of prices for a product sold in Kansas City is between $99 and $349, an estimate of the standard deviation of the prices would be about:
The number of T.V. homes in the sample having cable T.V. What is the probability that at least 2 T.V. homes in the sample are served by cable?
an article in the 1993 volume of the transactions of the american fisheries society reports the results of a study to
tim and elle visit a hospital where many people have the mumps. the probability that tim gets the mumps is .13 and the
for a particular company the number of sick days used by employees had a mean of 7 and a standard deviation of 2.a. a
a researcher wants to determine a 95 confidence interval for the mean number of hours that umkc students spend doing
find the approximate value of z that gives an area of 0.025 to the right of it. round your answer to the nearest
1.determine whether each of the following is an experiment or an observational study. also identify the explanatory and
Commute times: three random samples of time in minutes that commuters are stuck in traffic are shown. At anova =0.05, is there a difference in the mean times among the three cities?
a study is conducted to assess the potential benefits of an ayurvedic treatment to reduce high cholesterol. seven
An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews all of the teachers at the selected schools.
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