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A process is under control and follows a normal distribution with mean 100 and standard deviation 10. In constructing a standard -chart for this process, the control limits are set 3 standard deviations from the mean-i.e., 100 . The probability of observing an i outside the control limits is (.00135 + ,00135) = .0027. Suppose it is desired to construct a control chart that signals the presence of a potential special cause of variation for less extreme values of . How many standard deviations from the mean should the control limits be set such that the probability of the chart falsely indicating the presence of a special cause of variation is .10 rather than .0027?
Suppose a sample of 35 surveys shows a sample mean of 17 minutes. Use = 4 minutes. Is the premium rate justified? Formulate the null and alternative hypotheses for this application.
Using these data, construct a 95% confidence interval to estimate the average number of days a car is rented out. Assume that the number of days a car is rented is normally distributed in the population. What can you conclude from your calculations?
recently research physicians at mountain states have developed a surgery process they believe will reduce the average
question consider rolling a pair of fair dice.a what is the probability that the number of dots on the upward side of
the joint distribution of a proportion of votes for candidate x and a proportion of votes for candidate y is given by
For a one tailed hypothesis test (upper tail), the p-value is computed to be 0.034. If the test is being conducted at a 95% confidence, the null hypothesis.
the number of miles that the brake pads in a population of cars last is normally distributed. in a sample of 51 cars
Suppose that a malfunction was reported and it was found to be caused by other human errors. What is the probability that it came from station C?
consider the first order model equation in 3 quantitives independent variablese y 1 2x1 x2 -3x3a graph the relationship
a sample of 25 novels has a standard deviation of 9 pages. find the 95 confidence interval of the population standard
ABC Inc. and XYZ Co. are the two dominant companies providing chargers, adapters, and other accessories for cell phones.
The intensity level of an earthquake is based on the Richter scale. Using logarithms, the Richter scale measures an earthquake relative to (as a ratio of) the weakest possible tremor.
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