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The personnel department of a particular company has observed that 30% of the people the company hires are dismissed within a year because they are unable to perform adequately. To reduce the amountof turnover, the company decides to administer a test to all applicants. Data collected over several years suggest that 80% of new hires who remain with the company pass the test, and 90% of new hires who are dismissed fail the test.
a: What fraction of new hires pass the test?
b: What fraction of new hires who pass the test will be dismissed within a year?
c: You are interviewing a candidate who has failed the test, 0but you decide to hire the candidate anyway. What is the probability that this person will be with the company 1 year from now?
Time spent using e-mail per session is normally distributed, with μ = 8 minutes, and σ = 2 minutes. If you select a random sample of 25 sessions,
joey starts a paper route at age 15 and saves 15 each month in an annuity that pays 6.9. he continues this habit until
What must be true about the data sets to make the confidence intervals you constructed in parts (a) and (b) valid?
in 2006 merck released a vaccine named gardasil for hpv - the most common cause of cervical cancer among young women.
The width of a confidence interval will be:
a random sample of size 100 is drawn from a population with population proportion 0.70. find the probability that the
whites represent 77.7 of the usa and 38.8 is on welfare blacks represent 13.2 of the usa and 39.8 is on welfare and
Mention all samples of size 3, and compute the mean of each sample. Compute the mean of the distribution of sample means and the population mean.
Experienced relief of both itchy eyes and skin rash. What is the probability that a patient who takes the drug will experience relief of at least one of two symptoms?
the number of customers entering a store on a given day is poisson distribution with mean lambda 10. the amount of
A confidence interval for the population mean tells us which values of mean are plausible (those inside the interval) and which values are not plausible (those outside the interval) at the chosen level of confidence.
mcdonalds waiting times. you want to estimate sd for the population of waiting times at mcdonalds drive up windows. you
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