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The length of time between breakdowns of an essential piece of equipment is important in the decision of the use of auxiliary equipment. An engineer thinks that the best "model" for time between breakdowns of a generator is the exponential distribution with a mean of 15 days.
a) If the generator has just broken down, what is the probability that it will break down in the next 21 days?
b) What is the probability that the generator will operate for 30 days without a breakdown?
Perform the chisquare test for a uniform distribution. At α = .05, does this sample contradict the assumption that sales are the same for each beverage?
Figure out the best means to calculate the reliabilty of our work load index ie a measure of work load per empolyee per hour - is there a statistical measurement i could use? i really need to verify the accuracy of this measurement.
Given sample data arranged in a frequency distribution table. Use Excel to calculate the sample mean and variance from this data set.
Give 0.95 probability bounds on the value of the sample mean that would be obtained. Also give 0.90 probability bounds on the value of the sample mean.
Below is a plot of the Olympic gold medal winning performance in the high jump (in inches) for the years 1900 to 1996.
the standard deviation of 112 units.. What is the probability that the demand for this item in the upcoming week will be between 600 and 700 units.
For each of the following, indicate whether or not you would expect it to have a strong seasonal component and why.
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
Test the hypotheses that the average household income in the township is greater than $100,000. Hint: Start by stating the null and alternative hypotheses.
Formulate null and alternative hypothesis to test for no difference between the population mean credit card charges for groceries and the population mean card charges for dining out.
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
At your place of employment, 100 employees are randomly selected and asked the distance of their communte to work. From this group a mean of 15.2 is computed. Identify the following as either?
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