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A screening test which measures the level of a prostate speific antigen (PSA) is a commonly used tool for the detection of prostate cancer. Men with PSA levels greater than 10 have a chance of 67% of prostate cancer, whereas men whose PSA levels are between 4 an 10 have a 25% chance of having prostate cancer. For those whose PSA levels were lower than 4 there chance is only 5%. Suppose that 15% of men have PSA levels greater than 10, 10% of men PSA levels between 4 and 10 and 75% of men have PSA levels lower than 4.
a. What is the probability that a radnomly chosen man will develop prostate cancer?
b. What is the probability that a randomly chosen man hads a PSA level greater than 10, given that he has prostate cancer?
Normal distribution with a mean value of 150 sec and a standard deviation of 20 sec. The fastest 10% are to be given advanced training. What task times qualify individuals for such training?
calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. in 1990 the
A manufacturer of microwaves gathers information on microwave sales from a random sample of 50 stores in a large retail chain. In the sample, the mean number of microwaves sold per store last week was 19, with standard deviation 2.
computing the mean and standard deviation for the given data.1.a population of scores has micro 50 and s 12. if you
womens sat math scores in 2007 had the n499110 distribution. what percent of women scored 750 or better? round your
A manager of a supermarket estimated that 87% of customers use coupons in their grocery purchases. How large a sample is required to estimate the true proportion to within 0.01 with 98% confidence?
Sketch density curves that might explain distributions with fallowing shapes: symmetric, but with two peaks( i.e., two strong clusters of observations)
Add titles and modify the default colors, fonts, etc., as you judge appropriate to make the scatter plot effective. (b) Describe the relationship (if any) between X and Y. Weak? Strong? Negative? Positive? Linear? Nonlinear?
Suppose it is desired to estimate the population mean number of miles with a margin of error of ± 2 miles at 95% confidence. Do the data provide this desired level of precision? What action, if any, would you recommend be taken?
in testing a certain kind of truck tire over a rugged terrain it is found that 25 of the trucks fail to complete the
A major issue facing many states is whether to legalize casino gambling. Suppose the govenor of one state believes that more than 55% of the state's registered voters would favor some form of legal casino gambling.
However one of the children fails to solve the peoblems, so the researcher has an undetermined score. what is the best measure of central tendency for these data?
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