Concept explainers
Statistical Significance and Practical Significance. In Exercises 13-16, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.
15. Guessing Technique When making random guesses for difficult multiple-choice test questions with possible answers of a. b. c, d. and e, we expect to get about 20% of the answers correct. The Ashton Prep Program claims to have developed a better method of guessing. In a test of that program, guesses were made for 100 answers, and 23 were found to be correct. There is a 23% chance of getting such results if the program has no effect.
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