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Statistics. A manufacturer claims that the mean lifetime of its fluorescent light bulbs is 1500 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 1480 hours with a population standard deviation of 80 hours. Test the manufacturers claim. Alpha =0.05.
the number of people arriving for treatment at an emergency room can be modeled by poisson process with rate parameter
What is the treatment mean square? What is the mean square error? How many groups are included in the study?
The number of lightning strikes in a year at the top of a particular mountain has a Poisson distribution with a mean of 4.2. Find the probability that in a randomly selected year, the number of lightning strikes is 0.
How many subjects are needed to estimate the number of books read the previous year within one book with 99% confidence?
if we increase the size of our sample for ex. the pairs of data that we collect. will this affect linear correlation
the probability of a successful missile launch is 0.9. test launches are conducted until 3 successful launches are
Suppose we estimate this model with OLS, and there is a correlation between unobserved student traits (in the error term) with attendance. How does this bias the coefficient of attendance?
Twenty-five samples of size 4 resulted in statistics of x=30.0 minutes and R = 2.5 minutes for the company to completely clean a rug. Compute control limits for x- and R-charts and estimate the standard deviation of the process.
The analysis produces SS(within treatments) = 32, SS(between treatments) = 40, and SS(total) = 72. For this analysis, what is the MS(within treatments)?
Compute the variance and standard deviation of the number that will arrive within two days.
in a human factor experimental project it has been determined that the reaction time of a pilot to a visual stimulus is
You want to create a 90% confidence interval for the true average number of yards per game he throws. What is the margin of error for this estimate?
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