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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?
Joe is considering pursuing an MBA degree. He has applied to two different universities. The acceptance rate for applicants with similar qualifications is 25% for University A and 40% for University B.
Discuss the strengths and weaknesses of correlational and regression studies; discuss concepts such as positive and negative correlations, correlation coefficients, confounding, and causality.
The systolic blood pressure of a group of 18-year-old women is basically distributed with a mean of 120 mmHg and a standard deviation of 12 mmHg.
The 90% confidence interval to estimate the true average difference in nationwide sales quantity before the ad campaign and after is (0.39, 16.64). Which of the following is the appropriate conclusion? The differences were calculated as (after ad ..
Which are likely to be independent events? For those you think are not, suggest reasons why.
A new-car dealer is leasing various brand-new models for the monthly rates(in dollars) listed below. Estimate the true population variance and standard deviation in leasing rate with 90% confidence.
On the basis of the sample results, can we conclude that the mean annual lease rate is higher in Hong Kong than in Paris? Develop appropriate null and alternative hypotheses.
Distinguish the various observational study designs and the randomized controlled trial with regard to validity and feasibility.
Laura wanted to build a multiple regression model based on advertising expenditures and coffee times price index. Based on the selection of all normal values she obtained the following:
What is the margin of error for a 95% confidence interval for the difference of the two means (low capacity - high capacity)? (Answer to the nearest hundredth.)
Assume the population is normally distributed, the confidence level is 95%, n = 12, and σ is unknown.
Compute the Kappa statistic and its standard error regarding reproducibility of the diagnosis of dyspnea in the clinic.
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