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Call Center 1 Call Center 2
19.14 20.64
24.59 27.42
28.37 25.68
27.17 20.45
29.52 18.55
18.97 23.91
24.53 22.84
29.33 22.33
18.42 20.65
24.55 25.15
26.41 24.97
24.72 20.16
20.97 21.79
30.01 24.76
20.38 23.24
22.13 19.49
25.43 23.38
23.30 22.43
31.00 24.83
29.24 20.86
24.69 18.76
28.32 22.71
25.21 20.39
19.96 26.91
24.13 25.48
29.31 19.83
23.95 26.06
28.46 27.77
26.27 24.52
19.77 23.08
Our customers expect a call to be completed in 22 minutes. Using the data above, does either of our call centers meet this expectation with an alpha level of 0.05?
The data in the next table resulted from an experiment that used a completely random design. Test the null hypothesis that u1 = u2 = u3, where ui represents the true mean for treament i, against the alternative that at least two of the means differ..
Explain distribution of sample means (shape , Expected value , and standard error ) for samples of n=36 selected from population with a mean of m =100 and standard deviation of s=12.
Calculate expected value for each decision and choose the best one. Find out how much firm would be eager to pay to a market research firm to gain better information about future market conditions.
Given the following data, calculate the EMV for each investment alternative. Which is best based on the EMVs you calculated?
Construct a 90% confidence interval on the difference in fraction nonconforming between the two processes."
The average monthly electric bill of a random sample of 256 residents of a city is $90 with a standard deviation of $24.
A digital camcorder repair service has set a goal not to exceed an average of 5 working days from the time the unit is brought in to the time repairs are completed. A random sample of 12 repair records showed the following repair (in days)
The number of bombardment necessary to achieve the disintegration of a certain nucleus is assumed to have the distribution above. In one sequence in which b bombardments are available, of these have already failed to disintegrate the nucleus. What..
The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
An airline estimates that 98% of people booked on their flights actually show up. If the airline books 76 people on a flight for which the maximum number is 74
If the alpha level is changed from a = .05 to a = .01, (a) What happens to the boundaries for the critical regions? (b) What happens to the probability of a type I error?
Recognize and explain potential threats (up to 3) to external validity.
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