For Questions 1-4, consider the following: A study is designed to determine the effect of an office-training course on typing productivity. Fifteen typists who have not taken the course are randomly selected. The investigator assigns 20 pages of equally difficult text to be typed by each typist both before and after completing the training course. The investigator wants to find out whether the training course has reduced the number of errors by more than 10. Define d = Before - After. The sample mean of the 15 before values turn out to be 42.745. The sample mean of the 15 after values is calculated as 32.394. What is the point estimate of the difference in typing errors before and after taking the course (in other words, what is the point estimate for the mean of "d")? 00 -10.351 32.394 42.745 10.351 « Previous Next

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