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It is desired to estimate the mean time of continuous use until a wireless router will first required service. If it can be assumed that the standard deviation is 60 days, how large a sample is needed so that one will be able to assert with 95% confidence that the sample mean is off by at most 10 days?
for a certain type of electronic component the lifetime x in thousands of hours has an exponential distribution with
We desire to test at 0.05 level of significance whether modification increases the life of battery. What is our decision rule? Reject null hypothesis if calculated t is less than 1.96.
Modern aircraft engines are very reliable. One feature contributing to that reliability is the use of redundancy, where critical components are duplicated so that if one fails, the other will work.
If the population standard deviation of annual usage is 3,500 kwh, what is the probability that the sample mean will be each of the following?
The chance of winning a prize for each of the 15 plays is 50-50 if you bought 15 tickets, what is the chance of winning 10 or more prizes?
It is often stated in three-shift manufacturing organizations that the quality of work on the second shift is worse than on the first, and that the quality of work on the third shift is worst of all. How would you go about testing that premise?
A researcher is testing the effect of a new cold and flu medication on reaction time. A sample of n = 9 students is obtained and each student is given the normal dose of the medicine.
A Taguchi experiment is to be performed on the effects of lift, bore, stroke, and compression on engine performance with horsepower as the outcome variable. The factors were tested at each of the following levels in hopes of improving engine horse..
what are the strengths and weaknesses of correlational and regression studies. what are the concepts of positive and
the amount of gasoline sold daily at a service station is a value of x of a random variable x that is approximately
Do hotel managers on the average differ significantly in femininity score from men in general? Assume that the standard deviation of scores in the population of all male hotel managers is the same.
according to cnn business partner careerbuilder.com the average starting salary for accounting graduates in 2008 was at
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