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A manager at a local manufacturing company has been monitoring the output of one of the machines used to manufacture small aluminum plates. Past data indicates that if the machine is operating "properly," the length of the plates produced by this machine can be modeled as being normally distributed with a mean of 117 centimeters and a standard deviation of 5.2 centimeters. Suppose 10 plates produced by this machine are randomly selected. What is the probability that the average length of these 10 plates will be between 116 and 120 centimeters when the machine is operating "properly?"
A bond analyst is analyzing interest rates for corresponding municipal bonds issued by two different states. At α = .05, is there a difference in interest rates paid by two states?
Can we conclude at the 5% significance level that the population mean weight of athletic men is lower than the population mean weight of non-athletic men?
Determine and report the within-group slope which relates Y to Xc (for this, you will have to look at your regression printout).
At a 0.05 level of significance, does this data show that 2 year college students and private unversity students work an equivalent amount of time?
Suppose that during a basketball practice. Joe tries 3 shots from the free throw line; imagine further that he has a probability equal to 0.6 of making each shot and that the attempts are independent. Let 'X' be the number of baskets he makes in t..
Give the 90% confidence interval for the mean score in the population of all young women.
Construction of frequency distribution table for the given continuous data.
A random variable has a standard deviation of 16, and an unknown mean. Find the lowest size of a simple random sample so that the sample mean estimates the population mean with a standard error no larger than 0.25.
Last week Sarah had exams in Math and in Spanish. On the Math exam, the mean was u, = 30 with a = 5, and Sarah had a score of X - 45. On the Spanish exam, the mean was u, = 60 with 0 = 6 and Sarah had a score of X = 65. For which class must Sarah ..
Finding the probability selecting a defective item from a collection of items using tree diagram
Use the following data to write the normal equations of the linear regression between Y and X, and find the least squares regression.
What is the probability that a visually impaired student gets less than 6.9 hours of sleep?
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