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The random variable X, the time to failure (in thousands ofmiles driven) of the signal lights on an automobile has a Weibulldistribution with a = 0.04 and ß = 2.
(a) Find the density, mean and variance for X.
(b) Find the reliability function for X.
(c) What is the reliability of these lights at 5,000 miles? At10,000 miles?
(d) What is the hazard rate function?
(e) What is the hazard rate at 5,000 miles? At 10,000 miles?
(f) What is the probability that the lights will fail during thefirst 3000 miles driven?
What are the mean and standard deviation of the proportions of random samples of 400 motorcylce owners who own Harleys?
Standard deviation of 12%. Assume that scores in both classes follow a normal distribution. Convert Maria's midterm score of 84 to a standard z score.
If W denotes the total number of spaces one moves under these special conditions, find the mean and standard deviation of W.
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
Suppose adults have basically distributed IQ scores with a mean of 100 and an SD of 15. Find P65, the 65th percentile. Use the Z table.
question berdines chicken factory has several retail stores. when interviewing applicants for server positions the
For each sample, carry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
given a level of confidence of 95 and a population standard deviation of 13 answer the followinga what other
Four brands of lightbulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer.
Suppose we wish to predict the crawling age of a particular baby when the average outdoor temperature is 25°F six months after birth.
1.a researcher wishes to compare the effect of two stepping heights low and high on heartrate in a step-aerobics
Strack, Martin, and Stepper (1988) found that people rated cartoons as funnier when holding a pen in their teeth (which forced them to smile) than when holding a pen in their lips (which forced them to frown). For this study, identify the independ..
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