Questions from Business Statistics

Q: Refer to the data for problem 8. a. What

Refer to the data for problem 8. a. What does the null hypothesis of independence claim, in practical terms, for this situation? b. How many stockholders responding “Very likely&acir...

Q: For each of the following situations, tell whether a Pareto diagram

For each of the following situations, tell whether a Pareto diagram, an X chart, an R chart, or a percentage chart would be the most helpful. Give a reason for your choice. a.* Your workers all want...

Q: Continue with the data set in Table 18.5.4

Continue with the data set in Table 18.5.4, representing the lengths of broccoli trees after cutting. a. Find the center line for the R chart. b. Find the control limits for the R chart. c. Draw the R...

Q: Find the center line and control limits for each of the following

Find the center line and control limits for each of the following situations. a.* Percentage chart, sample size n¼300,

Q: Consider the data set shown in Table 18.5.5

Consider the data set shown in Table 18.5.5, summarizing recent numbers of errors in batches of 500 invoices. a. Find the percentage, p, for each batch. b. Find the average percentage,

Q: Consider the data set shown in Table 18.5.7

Consider the data set shown in Table 18.5.7, indicating hourly summaries of the temperature for a baking oven measured four times per hour. a. Draw an

Q: Find the probability that a particular set of eight consecutive points will

Find the probability that a particular set of eight consecutive points will fall on one side of the center line for a process that is in control.

Q: A tractor manufacturing plant has been experiencing problems with the division that

A tractor manufacturing plant has been experiencing problems with the division that makes the transmissions. A Pareto diagram, shown in Fig. 18.5.1, has been constructed based on recent experience. a....

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

What problems, if any, are visible in the control charts in Fig. 18.5.7? What action (if any) would you suggest? Fig. 18.5.7:

Q: Use a nonparametric test to see whether the median age of employees

Use a nonparametric test to see whether the median age of employees differs significantly from 40 years.