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A laboratory blood test is 95 percent effective in detecting a certain disease when it is, in fact, present. However, the test also yields a "false positive" result for 1 percent of the healthy persons tested. (That is, if a healthy person is tested, then, with probability 0.01, the test result will imply he has the disease.) If 0.5 percent of the population actually has the disease, what is the probability a person has the disease given that his test result is positive?
Administrative staff based at a business school in the UK are advised to take a 15 minute break from their personal computer after working on it for 90 minutes continuously. A random sample of 36 staff revealed that, one average a break was taken aft..
question when certain quantities are measured the last digits tend to be uniformly distributed but if they are
Categorize as simple, random, sample, stratified/systematic sample, cluster/convenience sample. List discharged hotel customers, divide them day their length of stay, and draw simple random samples from each group.
Find the probability of accepting a lot as a function of the actual fraction of defective chips. In particular, let the actual fraction of defective chips in a given lot equal any of 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14, 0.16, 0.18. Then compu..
If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a standard deviation of $78.11.
Archaeopteryx is an extinct beast having feathers like a bird but teeth and a long bony tail like a reptile. Five fossil specimens have preserved both the femur and humerus bones. The measurements (in centimeters) for each bone are given below.
Which statistical analysis technique should be used? What is the null hypothesis? Can an analysis be performed? Why or why not?
State the null and an alternate statement for the test and Extrinsic variable by Position Type - Identify the significance level, the test statistic, and the critical value and state whether you are rejecting or failing to reject the null hypothesis ..
Egyptians watch an average of 2.5 hours of television per person per day. If the standard deviation for the number of hours of television watched per day is 1.6 and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a..
If he were to randomly select 120 corks from the next box, then how many of these corks would John expect to be undersized?
The margin of error in the poll was reported as 6 percentage points (with a 95% degree of confidence). Which statement is correct?
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