STA 2023 Lecture Notes - Lecture 38: Mean Absolute Difference, Confidence Interval
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Testing the difference between two mean and two proportions. Section 9. 3 testing the difference between two mean: When the values are dependent, do a t test on the differences. Denote those differences with the symbol d, the mean of the population differences with ud, and the sample standard deviation of the differences with sd. Example 3: as an aid for improving students study habits, nine students were randomly selected to attend a seminar on the importance of education in life. The table shows the number of hours each student studied per week before and after the seminar. Step 1 state the hypotheses and identify the claim. We have enough evidence to conclude that this seminar increased the number of hours students study. A composition teacher wishes to see whether a new grammar program will reduce the number of grammatical errors her students make when writing a two-page essay. Step 1 state the hypothesis and identify the claim.