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Of 2,872 persons who had received radiation treatment in childhood because of an enlarged thymus, cancer of the thyroid developed in 24 and a benign thyroid tumor developed in 52. A comparison group consisted of 5,055 children who had received no such treatment (brothers and sisters of the children who had received radiation treatment). During the follow up period, none of the comparison group developed thyroid cancer, but benign thyroid tumors developed in 6. Calculate the relative risk for benign thyroid tumors: The answer is 15.2.
The textbook does not show the calculations, a word table showing the numerical values for a,b,c and d, related the formula for the measure of association (OR,RR,PAR,etc) or a stated summary statement describing the relationship of the data and measure of association i.e. Those who never eat raw eggs have 1.75 times as much risk(higher incident) as those who ate raw eggs almost daily (RR+1.75)
What is the expected number of crimes that will be solved? What is the standard deviation?
Set up hypotheses to test if distribution of birthdays can be considered coming from uniform distribution.
A soft drink company has recently received customer complaints about its one-liter-sized soft drink products. Customers have been claiming that the one-liter-sized products contain less than one liter of soft drink.
At the .01 significance level, can we conclude that there is more variation?
She collected the employee performance ratings recorded before and after workshop attendance and stored the paired ratings for all 35 in Perform.
Shopper Trak is a hidden electric eye designed to count the number of shoppers entering a store. When two shoppers enter the store together one walking in front of the other, the following possibilities apply.
We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
Which of the following(s) can be considered (a) variable(s)?
A survey of 10 different suburbs in Dallas Texas found the average gasoline to be $ 1.294 a gallon with a standard deviation of $ .0526. What is the critical value using a=.05 and what is the test value.
For a random sample of 50 batteries, what is the probability that the sample mean will be less than 27.5 hours?
Probability based on normal distribution. Suppose among X has a normal distribution, and find the indicated probability.
What is the total expected annual inventory cost at the optimal order quantity? What is the re-order point?
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