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Question: John Daum and Chris Yin are star swimmers at a local college. They are preparing to compete at the NCAA Division II national championship meet, where they both have a good shot at earning a medal in the men's 100-meter freestyle event. The coach feels that Chris is not as consistent as John, even though they clock about the same average time. In order to determine if the coach's concern is valid, you clock their time in the last 20 runs and compute a standard deviation of 0.85 second for John and 1.20 seconds for Chris. It is fair to assume that clock time is normally distributed for both John and Chris.
a. Specify the hypotheses to test if the variance of time for John is smaller than that of Chris.
b. Carry out the test at the 10% level of significance.
c. Who has a better likelihood of breaking the record at the meet? Explain.
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As the correlation coefficient increases from 0.85 to 0.88, do the points of the scatter plot move toward the regression line, or away from it?
Present graphical statistical crime data for a specific category of crime from three comparable size cities, counties, or states from three different regions.
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A financial institution has decided to open an office in a certain commu- nity if it can be established that the median annual income of families in the community is greater than $90,000. To obtain information, a random sample of 80 families was ..
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
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