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A time--terminated life testing plan is desired that will accept lots with a mean life of 400 hours with a probability of 0.99 and will accept lots with a mean life of 200 hours probability of 0.05.Thetest should be terminated by 80 hours.
a) Using Handbook H--108, determine the plan assuming the time to failure is exponential. Items that fail will be replaced immediately.
b) Now assume that failed items are not replaced during the test. UsingHandbook H--108, determine the plan assuming the time to failure is exponential.
Explain why random samples are preferred to nonrandom samples.
If all samples of size 64 are drawn, mean of sample according to Central Limit Theorem is 100.
Listed below are measured loads (in lb) on the left femur of crash test dummies used in the same cars listed in the Chapter Problem. Use a 0.05 significance level to test the null hypothesis that the different car categories have the same mean. Do..
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
It is estimated that 2% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 95% accurate. What is the probability that an athlete who tests positive is actually a user?
When the underlying average of a time series is very stable and there is no trend, cyclical, or seasonal influences,
At the .05 significance level, can we conclude that the guideline is still reasonable?
Consider a liter of 5 puppies (3 brown/2 black). Draw a probability tree indicating the probabilities for selecting 3 puppies without replacement? What is the probability that I will select 3 brown puppies? 1 brown and 2 black puppies? At least 1 ..
A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster.
Test whether the gender distribution for basketball fans is significant different from general college by proportion test.
To report their finding they want to create a 90% confidence interval. What would be the margin error for this confidence interval?
Elucidate the null and alternative hypothesis for the difference among the two means. In testing the difference between the means of two.
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