Assume that the mean number of meals people eat per day is 3. Which is the most

Question

Assume that the mean number of meals people eat per day is 3. Which is the most logical standard deviation? One hundredth of a meal per day 50 meals per day 3 meals per day 1 meal per day The mean amount of time it takes Alice to brush her teeth is 1 minute. Which standard deviation is the most logical? .005 minutes 12 seconds 5 minutes 6 weeks Approximately 95 percent of all scores of a population are between A z score of -2.00 and a z score of +2.00 Two standard deviations below the mean and one standard deviation above the mean A z score of -1.00 and a z score of 0.00 A z score of +1.00 and a z score of -1.00 I have z of -.50; you have a z score of +1.00. What percentage of the population score between us? 16 90 82 53 Laurel scores below the mean. Her z score is positive Her z score is negative She is at the 50th percentile Her score is extremely low. Jane took a test and scored 70. The mean was 60 and the standard deviation was 10. Jim took a test and scored 90. The mean was 85 and the standard deviation was 5. Relative to their own distributions, who scored the highest? Jane Jim They scored the same Not enough information.

Explanation / Answer

13. d. 1 meal per day

14. b. 12 seconds

15. a. A z score of -2 and a z score of +2

16. P(Z<1) - P(Z<-0.5) = 84-31 = 53 (d.)

17. b. Her z score is negative

18. c. They scored the same

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