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a) The time to fail has a Weibull distribution for machine X that cost $300 to manufacture and has beta = 5 and theta = 400. Machine Y cost $500 to manufacture and has beta = 5 and theta = 500. If the machine will have a life of 30 hrs , which machine should I brief to the boss to sell?
b) Following a lognormal distribution with a mean of 3000 rpm and std deviation of 0.87, what if the boss want a 5% chance of HW failure before selling, how often would I have to replace this hardware ?
To find z-score and required probabilities based on Normal distribution. Assume that childrens weekly allowances are normally distributed in the population.
Determine the expected value and standard error of the sum of 400 draws?
Determine a 99% confidence interval for mean pH in rainfall. How would you distinguish interval?
If statistically significant, do you think the difference is large enough to be important?
What is the likelihood the sample mean is greater than $22.50 but less than $25.00?
The 50 members of the placebo group had blood pressure lowered by an average of 15 points with standard deviation 8 points. To analyze this information we will use a, When testing whether or not the increases in spending are different, the test is ..
Pretests, posttests and threats to internal validity and please discuss all threats to internal validity.
She collected the employee performance ratings recorded before and after workshop attendance and stored the paired ratings for all 35 in Perform.
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
Calculate a 95% confidence interval for the population mean, based on the sample 10, 12, 13, 14, 15, 16, and 49. Change the number from 49 to 16 and recalculate the confidence interval. Using results, explain the effect of an outlier or extreme ..
In Excel, which of the following functions is used to conduct a hypothesis test (using the p -value) for a population variance
To find the necessary sample size to achieve the given level of accuracy of prediction.
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