5. Which of the following statements is not true? a. In symmetric distributions, the mean and the median will be approximately equal. b. When looking at the shape of the distribution, a distribution is skewed to the left when the left tail is shorter than the right tail. c. A stem-and-leaf display contains all the information needed to create a box plot. d. Relative frequencies are particularly useful when comparing the frequency distributions of two different size sets of data. e. The histogram of a normal sample should have a distribution shape that is not skewed. 6. Which of the following descriptive statistics is not measured in the same units as the data? a. standard deviation b. interquartile range c. median d. coefficient of variation e. all of the above are measured in the same units as the data. 7. A fair penny is tossed three times. The probability of observing a heads two times in a row is a. 1/3 b. 2/3 c. 1/4 d. 3/8 e. 1/2 8. Consider the following variable: The difference between annual earnings of Apple and Samsung. The level of measurement that can be used for this variable is: a. ordinal d. ratio b. interval e. mean absolute deviation c. nominal

3. The data in the table shows the mileage that students commute to school. B. Find the weighted mean. Miles Midpoint Frequency 10 - 14 12 8 15 - 19 17 C. Draw a histogram for the data. 20 - 24 22 9 25 - 29 27 21 30 - 34 32 7 A. How many students are in the class?

What is the best way to graphically present the shape of the distribution of numeric variable?   a. histogram   b. scatter plot   c. line graph   d. pie chart

10. Consider the box plot shown below: 2 4 6 8 10 12 14 16 a. What is the median of the data set? b. What are the upper and lower quartiles of the dataset? c. What is the interquartile range of the dataset? d. Is the data set skewed to the left, skewed to the right, of symmetric? e. What percentage of the observations in the data set lie to the right of the median? To the left of the upper quartile?

Below are numbers of hours that a sample of 18 recent college graduates reported working last week. 55 48 46 64 68 43 37 44 63 54 45 48 52 39 50 51 65 38 Construct a box and whisker plot for the data.

Below are numbers of hours that a sample of 19 recent college graduates reported working last week. 51, 64, 40, 70, 53, 62, 38, 71, 57, 48, 48, 36, 50, 61, 52, 65, 69, 35, 50 Send data to calculator Send data to Excel Using the tool provided, construct a box-and-whisker plot (sometimes called a boxplot) for the data. ? 35 40 45 50 55 60 65 70 75 Number of hours worked