STAT 206 Midterm Exam 2021 | MC306 Answer Sheet 2021 - 100% Correct

STAT 206 Midterm Exam MC306 Answer Sheet 2021 100% Correct True/False Please indicate if the following statements are true or false. 1. The variable of height is an example of a quantitative variable. True 2. Rating a restaurant by a number of stars is an example of an ordinal level of measurement. True 3. In a research study, it is always preferable for the researcher to choose his participants as carefully as possible rather than randomly accept samples. False 4. In the following chart, the height is the independent variable and the age of the tree is the dependent variable. False 5. The lower class limit represents the smallest data value that can be included in the class. True 6. The cumulative frequency is the sum of the frequencies accumulated to the upper boundary of a class in the distribution. True 7. A frequency polygon and a histogram have the same overall shape. True 8. A histogram is a graph that represents the cumulative frequencies for the classes in a frequency distribution. False 9. A stem and leaf plot is useful for keeping more precision than a grouped frequency distribution. True 10. A time series graph represents data that occur over a specific period. 11. A time series graph is useful for detecting long term trends over a period of time. True 12. A stem and leaf plot is a data plot that uses part of a data value as the stem and part of the data value as the leaf to form groups or classes. True 13. The mode of a set of data can be computed only when the data is numeric. False 14. The median can be a more appropriate measure of central tendency if the distribution of the data is extremely skewed. True 15. The coefficient of variation is the mean divided by the standard deviation expressed as a percentage. False - - - - -