Cardiovascular Disease Suppose the incidence rate of myocardial infarction (MI) was 5 per 1000 among 45- to 54-year-old men in 2000. To look at changes in incidence over time, 5000 men in this age group were followed for 1 year starting in 2010. Fifteen new cases of MI were found. A- Of the 15 new MI cases in the preceding study, 5 died within 24 hours. Test whether the 24-hour case fatality rate changed from 2000 to 2010. B- Suppose we eventually plan to accumulate 50 MI cases during the period 2010–2015. Assume that the 24-hour case-fatality rate is truly 20% during this period. How much power would such a study have in distinguishing between case-fatality rates in 2000 and 2010–2015 if a two-sided test with significance level .05 is planned?

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A:

Q: Is the difference between the mean annual salaries of statisticians in Region 1 and Region 2 more…

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A: It is given that the number of scores in the set is 10 and the population mean is 50.

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A: Given that  A sample of n = 6 scores has a mean of M = 10

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A:

Q: A sample of n=5 scores has a mean of x=9. what is Ex for this sample?

A: Mean = 9 n = 5

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A: Combined mean = n1x1¯+n2x2¯n1+n2

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A: As given: A score is 9 points above the mean.  It corresponds to a z score of +1.  It is required…

Q: For a population with mean 80 and standard deviation 6, what is the z-score corresponding to X = 68…

A: Given :Population mean u=80Standard deviation σ=6X=68

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A: Given that, n = 6  mean of M = 10

Q: The total rainfall for a certain year is 13.2. What was the mean monthly rainfall?

A:

Q: For a population with mean 90 and standard deviation 10, what is the z-score corresponding to X =…

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A: Consider the first 7 scores is x1, x2, x3, x4, x5, x6, x7 and the 8th score is, x8=20. The formula…

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A: Sample of n = 7 scores has a mean of M = 9. We know that, Mean =Sum of observationsTotal number of…

Q: A sample of n=5  scores has a mean of M=12. If one new score with a value of  X=18 is added to the…

A:

Q: What percent of the total population of data values are included at +/- 1 sigma? +/- 2 sigma? +/- 3…

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Q: Question 8 Which type of study is MOST LIKELY to be used? You need data on the average number of…

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A: Given information n=5 Mean M=12 Formula of mean is given by M=∑xin Where, xi are data points and n…

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A: The formula of the mean is: Meanμ = ΣX N

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A: Answer: For the given data,

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A: From the provided information, Population standard deviation (σ) = 18 Sample size (n) = 36

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A:

Q: For a population with population mean 80 and standard deviation10, what is the z-score corresponding…

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A: NORMAL DISTRIBUTION ,μ=40σ=8 proportion of the population is between 37 and 48=?

Q: The proportion of Americans who have frequent migraines is 15.2% according to the CDC. An…

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A: