Remarks/ExamplesStudents can represent the same data with different types of graphs and discuss the appropriateness of each graph based on the source of the data and the information required.
An example of a stem-and-leaf plot for the data set (34, 30, 38, 42, 67, 68, 68, 56, 54, 34, 82, and 85) is as follows:
Legend: 3| 234 means scores of 32, 33, and 34
What is the median of the data set? What is the mode of the data set?
TEST ITEM SPECIFICATIONS
This benchmark may be assessed using:
- Clarification :
Students will read and interpret data displayed in histograms, stem-and-leaf plots, and circle graphs.
Students will determine the correct type of graph to use to display a set of data.
- Content Limits :
Items may provide or include calculating measures of central tendency and variability for the data displayed in histograms, stem- and-leaf plots, and circle graphs only.
The number of data pieces displayed should not exceed ten when a measure of central tendency is being calculated.
The number of data pieces displayed should not exceed 25 when a measure of central tendency is not being calculated.
Percents used in items assessing circle graphs will be limited to whole-number percents.
- Stimulus Attributes :
Items should be set in a real-world context.
Graphics should be used in all items.
Gridded-response items will not include estimation of information from a histogram, stem-and-leaf plot, or circle graph.
SAMPLE TEST ITEMS (2)
- Test Item #: Sample Item 1
- Question: Television programs are separated into parts by commercials and network promotions. The circle graph below shows the percent of a 60-minute television show that is used for commercials, promotions, and the program itself.
Which is closest to the number of minutes used for commercials and promotions during that 60-minute television show?
- Difficulty: N/A
- Type: MC: Multiple Choice
- Test Item #: Sample Item 2
- Question: Dr. Neal is a veterinarian. In one day, he examined 12 cats. He recorded the weights, in pounds, of the cats in the stem-and-leaf plot below.
Based on the information in the stem-and-leaf plot, how many cats did Dr. Neal examine that weighed more than 10 pounds?
- Difficulty: N/A
- Type: GR: Gridded-Response