Determine probability of failure within given hours
Suppose the exponential distribution, the particular light bulb has the failure rate of .002 units per hour. Determine probability of failure within 400 hours? Compute reliability function?
Expected delivery within 24 Hours
What fraction survive fewer than 880 days? what length of warranty is required so that no more than 10% of batteries will be anticipated to fail during warranty period?
In the test of statistical hypotheses, the P-value tells us
Assume that the license plate should has the sequence of two letters followed by 4 digits, or 3 letters followed by 3 digits. Find number of different license plated can be made?
Assume we want 90% confidence interval for average amount of time (in minutes) spent per week on homework by students in large introductory statistics course at the large university.
For the most current year available, the mean annual cost to attend a private university in the United States was $20,157. Assume the distribution of annual costs follows the normal probability distribution and the standard deviation is $4,425.
Assume that for sample of n=11 measurements, we find out that (xbar=72) and s=5. Suppose normality, calculate the confidence intervals for population mean U with the following levels of confidence:
A previous study of the nickels showed that standard deviation of the weight of nickels is 150 milligrams. How many nickels does a coin counter manufacturer need to weigh so that she can be 98% confident that her sample mean is within 25 milligram
A researcher wishes to know, with 98% confidence, the percentage of women who wear shoes which are too small for their feet. A previous study conducted by Academy of Orthopedic Surgeons found that 80% of women wear shoes that are too small for the
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