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Disease X is one that often results in severe illness, but never is fatal. On March 21, 1990, 30 students developed disease X among all students in an introductory epidemiology course at a university. (Assume all epidemiology students were exposed to the index case, the instructor.) Through antibody titers we were able to determine the following:
a. of exposed students not infected = 40 b. of exposed students with subclinical infection = 10 c. of exposed students with mild symptoms = 10 d. of exposed students with moderate symptoms = 10 e. of exposed students with severe symptoms = 10
Using your knowledge of infectious disease epidemiology, quantify the pattern of disease X in this group, i.e., what are the infectivity, pathogenicity, and virulence of disease X?
Describe appropriate treatment means μ1, μ2 and μ3. After that Test for statistically significant differences between these treatment means. Set α = 0.05.
Explain the logic of what you have done, writing as if you are speaking to someone who has never heard of correlation (but who does understand the mean, deviation scores, and hypothesis testing);
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
A test on zoology is to be given next week. Suppose 75 percent of the students study for the test and 25 percent do not. If a student studies for the exam, the probability that he or she will pass is 0.90. If the student does not study, the pro..
A manufacturer of 35-mm cameras knows that a shipment of 30 cameras sent to the large discount store contains 8 defective cameras. The manufacturer also knows that the store will choose two of the cameras at a random, test them, and accept the shi..
Describe the data appear the strength of the relationship among variables is sufficient to warrant using linear regression forecasting.
The sample size n, the sample means, and the sample standard deviations for the two groups are given
The average number of days absent per student per year at West Valley School is 17 days with a standard deviation of 4 days. How many standard deviations from the mean is 6 absent days?
Would you conclude that your data set is approximately normal? If so, what percentage of your data values lie:
Harry and Melissa Jacobson produce handcrafted furniture in a workshop on their farm. They have obtained a load of 600 board feet of birch from a neighbour and are preparation to produce round kitchen tables and ladder-back chairs during the next ..
If a card is drawn at random from a standard 52-card deck, what is the probability that the card drawn is one of the following?
What percentage of bottles can we expect to have a volume less than 32 oz?
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