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A manufacturer of disk drives for notebook computers wants a MTBF of at least 50,000 hours. Recent test results for 15 units were one failure at 10,000 hours, one at 24,000 hours, and two more at 45,000 hours. The remaining units were still running at 60,000 hours.
A) Number of failures per unit-hour =_____failures per hour (round your response to eight decimal places)
B) The mean time between failures (MTBF) is the expected time between a repair and the next failure of a component. MTBF at this time in testing =_______hours
The "t-statistic" for testing whether the slope parameter was unity or not was -3.6. What is the estimated standard error for the estimated slope coefficient?
What is the purpose of a Wilcoxon signed-rank test? Explain. The Wilcoxon signed-rank test resembles which parametric test(s)? Explain.
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
Average of this group is 229. Population standard deviation for both groups is 6. At α = 0.01, is there difference in cholesterol levels between two groups?
Determine the level of measurement for these items related to the newspaper business? The following data gives the weekly amounts spent on groceries for sample of households.
On any given day, about 45% of the stocks on the American Stock Exchange increase in value. A random sample of four independent stocks is chosen.
Ppopulation with a mean of 240 and standard deviation of 18. Find the mean & standard deviation of sample distribution of the mean?
the average travel time to work for new york city residents is 36.5 minutes time almanac 2001. assume that the
An advantage of the permutation test over the t test for a difference in means, can Permutation tests be used for tests when we believe the two populations differ under the null hypothesis.
Several questions will be asked but the main outcome measure of interest will be the percentage of customers who were completely satisfied and plan to return and the average amount spent.
The new Lucky Lady Casino wants to increase revenue by providing buses that can transport gamblers from other cities. Research shows that these gamblers tend to be older, they tend to play slot machines only, and they have losses with a mean of $1..
scenario 1 a survey was conducted to measure the height of us males. in the survey respondents were grouped by age. in
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