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1. A test indicates the presence of a particular disease 90% of the time when the disease is present and the presence of the disease 2% of the time when the disease is not present. If 0.5% of the population has the disease, calculate the conditional probability that a person selected at random has the disease if the test indicates the presence of the disease.
2. A hospital receives two-?fths of its ?u vaccine from Company A and the remainder from Company B. Each shipment contains a large number of vials of vaccine. From Company A, 3% of the vials are ineffective; from Company B, 2% are ineffective. A hospital tests n = 25 randomly selected vials from one shipment and ?nds that 2 are ineffective. What is the conditional probability that this shipment came from Company A?
Which of the following would have a binomial distribution and evaluate the binomial coefficient
For following set of scores, prepare a frequency distribution, a histogram, and a stem-and-leaf display for each variable. Also calculate the mean, the median and the standard deviation of each score.
Critically discuss how you can apply the concept and method of interval estimation to help you solve some of the problems in a regularly accounting department. Give a few examples.
Find the indicated probability using the geometric or Poisson distribution. A newspaper finds that the mean number of typographical errors per page is nine. Find the probability that?
Use this information to determine the empirical probability that the next bird to visit the feeding station will be a dove.
Give null and alternative hypotheses for this test in symbolic form.
How many commuters must be randomly selected to estimate the mean driving times of Chicago commuters? If we want 99% confidence that the sample mean is within 2 minutes of the population mean, and the population standard deviation is known to be 1..
A population of data from a paper supply company is known to have a mean weight of 55 ounces per ream and a population standard deviation of 5 ounces. The population is known to be bell shaped and symmetrical. Which of the following statements is ..
A month is classified as "extremely wet" if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as "extremely wet".
A manufacturer of batteries is considering three new battery designs. An attempt was made to determine whether the mean lifetime in hours is the same for each of the three designs.
A library checks out an average of 250 books per day, with a standard deviation of 75 books. If a sample of 36 days of operation is selected and the sample mean is computed,
For the past 20 years, the high temperature on April 15th has averaged (j = 62 degrees with a standard deviation of a = 8. Last year, the high temperature was 66 degrees.
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