Measures of Central Tendency
What are the three measures of central tendency?
Mean, Median, Mode
Find the range of this data set: 17, 47, 26, 2, 31, 19
45
What are the five values (5-number summary) needed to make a box-and-whisker plot?
Minimum, 1st quartile, median, 3rd quartile, maximum
This Stem and Leaf plot has ______ items of data.
Ages of Parents | |
Stem | Leaf |
3 | 1 4 4 9 |
4 | 0 0 0 1 2 3 5 7 |
5 | 2 3 |
Key: 3 1 = 31 years old
What is 14?
This is the mode of the following book costs: 5, 5, 9, 49, 11, and 5
What is 5?
Find the mean rounded to the nearest tenth: 17, 26, 37, 22, 30, 19, 21
24.6
Caleb wrote a statistical question. Which is a statistical question?
A. How long does it take students to walk to school?
B. What time is today's football practice?
C. What day of the week does April 26th fall on this year?
D. How many points did our team score in yesterday's game?
A. How long does it take students to walk to school?
The "box" part of the box plot represents what percent of the data?
50%
Most student completed homework in this amount of time, according to this stem and leaf chart.
Time to Complete Homework | |
Stem | Leaf |
3 | 2 2 2 2 2 2 4 |
4 |
|
5 | |
6 | 9 |
7 | 6 8 |
8 | 4 |
Key: 3|2 = 32 minutes | |
What is 32 minutes.
Calculate this measure of central tendency by adding all the data values together and dividing the sum by the total number of data values.
What is the mean?
Find the median: 197, 56, 203, 79, 145, 2
112
The measure of variability of a numerical data set that is the difference between the greatest and least values in a data set.
What is the range?
What is the median of the data set: 72, 90, 84, 76, 68
76
Ms. Jackson's Quiz Scores
Stems | Leaves |
6 | 3 6 |
7 | 2 9 |
8 | 4 7 7 |
9 | 0 0 1 1 3 3 3 |
Key: 6|3 means 63 | |
The mean is______. (round to the nearest whole number)
What is 84%.
The mean of the data set of the number of books these five people own: 37, 50, 53, 17, 10, 49
What is 36.
The list shows the growth in centimeters of 12 plants during one week.
6, 7, 7, 8, 8, 8, 9, 9, 9, 10, 11, 11, 15
What is the mode of the data?
The mode is 8 and 9.
Which statistical question produces a categorical variable?
A. What is your shoe size?
B. How many siblings do you have?
C. What is your favorite activity outside of school?
D. How many hours did you spend watching television last night?
C. What is your favorite activity outside of school?
What are the 1st and 3rd Quartiles of the data set: 19, 22, 15, 20, 12
13.5 and 21
Number of crimes committed in 1984
| ||||||||||||||||||||||||||||
What percent of the data represents the number of months that had less than 90 crimes?
25%
What is the median? 21.5, 25.5, 24.5, 18.5, 18.5, 7.5, 33.5, 20.5
21
What value of x makes this data set have a mean of 6: 10, 6, 12, 3, x, 0
5
A math class consisting of 20 students is surveyed to find out about their siblings. Each student is asked to respond with one word that best describes their siblings. They can choose brothers, sisters, both, or none.
What type of graph can be used to best display the data from the class?
percent bar graph
What is the IQR of the set of data? 0, 0, 0, 1, 1, 3, 3, 3, 4, 4, 4, 6, 6, 7, 7, 7, 8, 8, 9, 10
What is 5?
Charlotte made a dot plot. She says that the median and the mean of the data in the plot must be about the same. How did Charlotte arrive at that conclusion?
A. The dot plot is skewed to the right.
B. One value has many data points.
C. The dot plot is approximately symmetrical.
D. There is an even number of data points.
C. The dot plot is approximately symmetrical.
Juanita wants to know whether to use the mean or the median to represent the age of middle school students.
Which explains the measure Juanita should use?
A. The distribution for the age of the students would be symmetrical, so she can use either the mean or the median.
B. The distribution for the age of the students would be skewed right, so she should use the mean.
C. The distribution for the age of the students would be skewed left, so she should use the median.
A. The distribution for the age of the students would be symmetrical, so she can use either the mean or the median.