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The length of time (in months after maintenance) until failure of a bank's surveillance television equipment has a Weibull distribution with α = 2 and β =60 months. If the bank wants the probability of a breakdown before the next scheduled maintenance to be 0.05, how frequently should the equipment receive periodic maintenance?
question 1you are a data analyst working for the australian petrol pricing commissioner and have been requested to
For a normal distribution, the z-score boundary that separates the lowest 2.5% of the scores from the rest is z = -1.96
Yoonie is a personnel manager in a large corporation. Each month she must review 16 of the employees. From past experience, she has found that the reviews take her approximately four hours each to do with a population standard deviation of 1.2 hours...
Political polls typically sample randomly from the U.S population to investigate the percentage of voters who favor some candidate or issue. The number of people polled is usually on the order of 1000. Suppose that one such poll asks voters how they ..
Calculate the Relative Precision Index in each case and, from the table on the following page, state the relative precision for each group and what remedial action should be taken to bring it back within specification limits?
Mickey Lawson is considering investing some money that he inherited. The following payoff table gives the profits that would be realized during the next year for each of three investment alternatives Mickey is considering:
Descriptive Statistics and Z-scores
Heights of swedish men follow a normal distribution with mean 72 in and standard deviation of 5 in. How high must a doorway be so that 90% of swedish men can go through without having to bend?
A study of 37 graduates of four-year colleges revealed the mean amount owed by a student in student loans was $16,381. The standard deviation of the sample was $1,352. Construct and explain a 90% confidence interval estimate of the population mean am..
A typical adult has an average IQ score of 105 with a standard deviation of 20. If 20 randomly selected adults are given an IQ tesst, what is the probability that the sample mean scores will be between 85 and 125 points?
in a regression analysis a nurse researcher found a correlation of .82 between pain relief scores and satisfaction with
Assume Z is a random variable with a standard normal distribution ( the is, a mean =0 and a standard deviation of 1). What is P(Z -0.5) ?
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