# Question

Construct a 99% confidence interval estimate for the difference in the number of exercises professors think are necessary and the number the students deem necessary for the situation described in Exercise 12. Do you expect the confidence interval estimate to include zero? Why or why not?

In exercise

One of the criteria statistics professors use to select a textbook is the number of exercises provided. One particular topic in statistics is selected: the t-test of the mean. A random sample of 15 professors is asked how many exercises students should do in order to master the topic. The sample average was 19.2, with a standard deviation of 5.2. A random sample of 20 students who demonstrated that they had mastered the topic by successfully completing some related questions was selected from these professors' classes. The students were asked how many exercises they actually completed for this topic.

In exercise

One of the criteria statistics professors use to select a textbook is the number of exercises provided. One particular topic in statistics is selected: the t-test of the mean. A random sample of 15 professors is asked how many exercises students should do in order to master the topic. The sample average was 19.2, with a standard deviation of 5.2. A random sample of 20 students who demonstrated that they had mastered the topic by successfully completing some related questions was selected from these professors' classes. The students were asked how many exercises they actually completed for this topic.

## Answer to relevant Questions

A consumer group tested two brands of inkjet printer cartridges for a particular printer to see whether there was a difference in the number of pages produced before the cartridge ran out of ink. The printers were tested in ...Create a 97% confidence interval estimate of the average increase in the amount of time the financial advisor described in Exercise 18 above is spending with each of her clients. In exercise A financial advisor is concerned ...Why is the unequal-variances version of the t-test of µ1 – µ2 generally preferred to the equal-variances version? Mention three reasons. Refer to your analysis for Develop Your Skills 11.2, Exercise 7 (page 420). Which group of customers has the highest average purchases? In exercise The owner of a winery is wondering whether the average purchase of visitors ...A college wants to compare the annual salaries of graduates of the four different streams of its business diploma program, five years after graduation. The college randomly selects graduates from each of the streams ...Post your question

0