7 Multiple chose questions Circle the correct answer 71 A Ty

7. Multiple chose questions. Circle the correct answer. 7.1. A Type I error is committed if we make (a) an incorrect decision when the null hypothesis is false. (b) an incorrect decision when the null hypothesis is true. (c) a correct decision when the null hypothesis is false. (d) a correct decision when the null hypothesis is true. 7.2. According to the Normal Rule, approximately what percent of the observations are within three standard deviations of the mean? (a) 50% (b) 95% (c) 99.7% (d) 68% 7.3. If we accept the null hypothesis when it is false, then we have committed: (a) a Type II error. (b) both a Type I error and a Type II error. (c) a Type I error. (0) neither a Type I error nor a Type II error 7.4. Which of the following statements is an appropriate null hypothesis (a) The population proportion is equal to 95. (b) The population proportion is not equal to 95. (c) The population proportion is equal to 0.05. (d) The population proportion is not equal to 0.05.

Solution

7.1 c

7.2 c

7.3 c

7.4 c