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Suppose the incidence rate of MI ( myocardial infarction) per year was 5 per 1000 among 45 to 54 year old men in 1990. To look at changes in incidence over time, 5000 45 to 54 year old men were followed for 1 year starting in 2000. Fifteen new cases of MI were found. A. Suppose we eventually plan to accumulate 50 MI cases during the period 2000-2005. Assume that the 24-hour case-fatality is truly 20% during this period. How much power would such a study have in distinguishing between case-fatality rates in 1990 and 2000-2005 if a two-sided test with significance level .05 is planned? B. How large a sample is needed in the previous problem to achieve 90% power?
The annual real return Y on the Diversified International Fund has mean 11% and standard deviation 17%, and the correlation between X and Y is 0.6. The return on Linda's portfolio is R = 0.7X + 0.3Y. What are the mean and standard deviation of R?
Of those not having lung disease, 25.3% are smokers. Determine the probability that a randomly selected smoker has lung disease.
The Sony corporation produces a Walkman that requires two AA Batteries. The mean life of these batteries in this product is 35.0 hours. The distribution of the battery lives closely follows the normal probability distribtion with a standard deviat..
Is the transportation model the example of decision making under certainty or decision making under uncertainty? Provide the real-world example illustrtating why it is certainty or uncertainty.
Explain the overall statistical significance of the model, Explain the statistical significance for each independent variable in the model
Explain the chi-square test of homogeneity and show the formula for the test statistics for the test of homogeneity. Describe a sign and test and show the six steps of the test-of-hypothesis procedure.
A processor of carrots cuts the green top off each carrot, washes the carrots, and inserts six to a package. Twenty packages are inserted in a box for shipment. To test the weight ofthe boxes, a few were checked.
Bring to mind a research question that interests you, or a current event that utilizes statistics to present results, that you can use as an example for this discussion. State the research question or the current event and results.
Identify the regression equation and make the prediction. Show your procedure, or explain how you reached your answer. Costs of Television: Find the best predicted quality score of a Hitachi television with a price of $1900. Is the predicted qualit..
Four different assembly processes were under consideration. Sixteen workers were randomly assigned to the four processes, eight per process. The number of correctly assembled units in an eight-hour work shift was recorded:
Results were analyzed using one -way ANOVA and included SSTR =7 , 102 and SSE = 10 ,511. Are all 8 tapes equally appealing on average? Determine p value?
Assuming we can verify that the data set is approximately normally distributed, what percentage of times will the server be down less than 24 minutes?
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