11. Which of the following statements is the most accurate description for the concept of standard deviation? A The square root of the total distance from the smallest score to the highest score. B. The squared average distance between all scores and the mean. C. The total distance from the smallest score to the highest score. D. The average distance between a score and the mean. 12. The standard deviation of a student's grades is zero. What do you know about the grades of this student? Whv do you say so? Choose one letter only. A The student scored low grades. C. The student's grade is unpredictable. B. The student got a B on all tests. D, The student scored the same grade every time.

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The coefficient of variation CV describes the standard deviation as a percent of the mean. Because it has no units, you can use the coefficient of variation to compare data with different units. Find the coefficient of variation for each sample data set. What can you conclude? Standard deviation CV = • 100% Mean E Click the icon to view the data sets. Data Table ..... CVneights = 71.2% (Round to the nearest tenth as needed.) Heights Weights 68 181 77 169 72 167 72 207 71 177 70 175 78 185 69 186 67 221 70 216 67 209 73 206

← The numbers of regular season wins for 10 football teams in a given season are given below. Determine the range, mean, variance, and standard deviation of the population data set. 2, 10, 15, 4, 12, 9, 13, 10, 5, 7 The range is 13. (Simplify your answer.) The population mean is 8.7. (Simplify your answer. Round to the nearest tenth as needed.) The population variance is 15.6. (Simplify your answer. Round to the nearest tenth as needed.) The population standard deviation is (Simplify your answer. Round to the nearest tenth as needed.)

The 2004 Cincinnati Bengals scored 24, 16, 9, 17, 17, 23, 20, 26, 17, 14, 58, 27, and 28 points in their first 13 games. 2. Find the mean and the standard deviation of 3. Remove the lowest score from the data set. the data. Then find the mean and standard deviation of the new data. 4. How do the standard deviation and mean change when you remove the lowest number? Why do you think this is?

You are asked to find some descriptive statistics for the heartrate data. Use the methods in the practice activity as a guide to help you find the mean, median, and standard deviation for the heartrate data. Mean: 74.1 Median: 74 Standard Deviation: 6.5 Which measure of central tendency is the most appropriate for the heartrate data?