Questions from Business Statistics

Q: Three advertisements have been tested, each one using a different random

Three advertisements have been tested, each one using a different random sample of consumers from the same city. Scores indicating the effectiveness of the advertisement were analyzed; the results are...

Q: Refer to the data for problem 6. Select the two additives

Refer to the data for problem 6. Select the two additives with the largest average difference in waste and answer the following. (Use the least-significant difference test method for this problem, sub...

Q: In an attempt to regain control of your time, you have

In an attempt to regain control of your time, you have been recording the time required, in minutes, to respond to each telephone call for the day. Before you make changes (such as referring certain t...

Q: Refer to the data for problem 11. Continue using the logarithms

Refer to the data for problem 11. Continue using the logarithms of the lengths of calls. a. Find the F statistic and its numbers of degrees of freedom. b. Find the critical value from the F table at t...

Q: Refer to the data for problem 11. Continue using the logarithms

Refer to the data for problem 11. Continue using the logarithms of the lengths of calls. a. Find the average difference and its standard error for every pair of types of calls (subtracting smaller fro...

Q: Use multiple regression with indicator variables, instead of one-way

Use multiple regression with indicator variables, instead of one-way ANOVA, to test whether the quality data in show significant differences from one supplier to another. (You may wish to review the m...

Q: Compare the overall average for the day shift to that for the

Compare the overall average for the day shift to that for the night and swing shifts (refer to Table 15.5.4). Does it appear that there are large differences (more than two or three quality points) am...

Q: Is there a significant interaction between supplier and shift in Table 15

Is there a significant interaction between supplier and shift in Table 15.5.4? Justify and interpret your answer. Table 15.5.4:

Q: Which is better: competition or cooperation? And does the answer

Which is better: competition or cooperation? And does the answer depend on whether the participants share the same values? A study by Cosier and Dalton sheds light on these issues.11 One of their ANOV...

Q: What would you recommend? Are there any other considerations that might

What would you recommend? Are there any other considerations that might change your mind?