math 302

If a teacher is trying to prove that a new method of teaching economics is more effective than a traditional one, he/she will conduct a: 2. In an article appearing in Today’s Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed the sample mean number of calories per serving to be 78 wi...