Questions from Business Statistics

Q: Is it proper to multiply the average order size, $42

Is it proper to multiply the average order size, $42.33, by the number of addresses (1,300,000) in the target mailing?

Q: Repeat the previous problem for a different product. For 142 outgoing

Repeat the previous problem for a different product. For 142 outgoing consumers, the average rating was 7.28, and the standard deviation was 2.18. For 277 shy consumers, the average rating was 8.78, a...

Q: Repeat problem 49 for yet another product. For 158 outgoing consumers

Repeat problem 49 for yet another product. For 158 outgoing consumers, the average rating was 7.93, and the standard deviation was 2.03. For 224 shy consumers, the average rating was 8.11, and the sta...

Q: A cup of coffee is found to have only 72.8

A cup of coffee is found to have only 72.8 milligrams of caffeine. Test (at the 5% level) whether the beans used could have come from the same population as those that generated the data in problem 47...

Q: In a random sample of 725 selected for interview from your database

In a random sample of 725 selected for interview from your database of 13,916 customers, 113 said they are dissatisfied with your company’s service. a. Find the best estimate of the percentage of all...

Q: Your factory’s inventory level was determined at 12 randomly selected times last

Your factory’s inventory level was determined at 12 randomly selected times last year, with the following results: 313, 891, 153, 387, 584, 162, 742, 684, 277, 271, 285, 845 a. Find the typical invent...

Q: Your bakery produces loaves of bread with “1 pound” written

Your bakery produces loaves of bread with “1 pound” written on the label. Here are weights of randomly sampled loaves from today’s production: 1.02,0.97, 0.98,1.10,1.00, 1.02,0.98, 1.03,1.03, 1.05, 1....

Q: Consider the data set in Table 11.3.1,

Consider the data set in Table 11.3.1, representing the ages (in years) and maintenance costs (in thousands of dollars per year) for five similar printing presses. a. Draw a scatterplot of this data s...

Q: Using the donations database on the companion site, and using only

Using the donations database on the companion site, and using only people who made a donation in response to the current mailing, consider predicting the amount of a donation (named “Donation_D1” in t...

Q: Using the donations database on the companion site, and using only

Using the donations database on the companion site, and using only people who made a donation in response to the current mailing, consider predicting the amount of a donation (named “Donation_D1” in t...