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A life testing plan is to be terminated after the third failure. It should accept a lot that has an acceptable mean life of 600 hours with a probability of 0.99. Failed items are not replaced during the test.
A sample of eight items is chosen, and three failures are observed at the following times (in hours): 200, 240, 250. Using Handbook H-108, should the lot be accepted?
question previous small study was investigating the total cost of 10 specific items of fruits and vegetables which
a university found that 30 of its students withdraw without completing the introductory statistics course. assume
You are the manager of a fast food restaurant. You want to determine whether the population mean waiting time to place an order has changed in the past month from its previous population mean value of 4.5 minutes.
What is the probability that among 10 true hypertensives at least 50% are being treated appropriately and are complying with this treatment?
Let X be N( µ, 100). To test H0 : µ = 80 against H1 : µ > 80, let the critical region be defined by C = {(x1 , x2 , • • • , x25 ) : x > 83}, where x is the sample mean of a random sample of size n = 25 from this distribution.
Ethnic Group A: N = 15 M= 55 S2 = 6.5 Ethnic Group B : N = 23 M= 51 S2 = 4.5. If the standard deviation of the distribution of the difference between means is .76, what is the t score?
a dean of a business school wants to know if the proportion of graduates who use statistical inference within the first
200 students took a test. The scores were normally distributed. Your score was in the 60th percentile. How many people scored at or below your score?
It is used when it doesn't make sense to look at the mean of such variables. Explain analysis of variance, multivariate statistics, and non-parametric methods.
1. A developer wants to claim that his new "green" home design results in lower electricity use than in conventional homes. His 2,000 square foot model home uses 1,200 kilowatt hours per month on average.
describe the direction of the relationship between the hamstring strength index 60degs and the shuttle run test.
Suppose we conduct an ANOVA test of four treatment means and reject the null hypothesis. Construction of a confidence interval for the difference between the first and second sample mean revealed the interval to be 10 plus or minus 12. We conclude
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