Questions from Business Statistics

Q: Here are the numbers of new customers who signed up for full

Here are the numbers of new customers who signed up for full service during each quarter of last year: 106, 108, 72, and 89. a. How many would you have expected to see in each quarter if these custome...

Q: Why is it much more difficult to establish independence than it is

Why is it much more difficult to establish independence than it is to establish dependence (lack of independence)?

Q: Are your customers special? In particular, is their interest level

Are your customers special? In particular, is their interest level in your promotional newsletter higher than for potential customers (who are not currently customers)? Justify your answer by reportin...

Q: What problems, if any, are visible in the control charts

What problems, if any, are visible in the control charts in Fig. 18.5.5? What action (if any) would you suggest? Fig. 18.5.5:

Q: What problems, if any, are visible in the control charts

What problems, if any, are visible in the control charts in Fig. 18.5.6? What action (if any) would you suggest? Fig. 18.5.6:

Q: What problems, if any, are visible in the control charts

What problems, if any, are visible in the control charts in Fig. 18.5.3? What action (if any) would you suggest? Fig. 18.5.3:

Q: What problems, if any, are visible in the control charts

What problems, if any, are visible in the control charts in Fig. 18.5.4? What action (if any) would you suggest? Fig. 18.5.4:

Q: An advertisement is being tested to see if it is effective in

An advertisement is being tested to see if it is effective in creating the intended mood of relaxation. A sample of 15 people was tested just before and just after viewing the ad. Their questionnaire...

Q: a. What is the difference (if any) between the

a. What is the difference (if any) between the Wilcoxon rank-sum test and the Mann-Whitney U test? b. What is the relationship between the Wilcoxon rank-sum test, the Mann-Whitney U test, and the test...

Q: a. What happens if there is an outlier in one of

a. What happens if there is an outlier in one of the samples in a test of two unpaired samples? For each case (very large or very small outlier), say what the rank of the outlier would be. b. Which st...