Quantitative data

mean

median

mode

range

averageadd all of the numbers and divide by the number of numbers you have

the middle number when the numbers are in order

the number(s) that show up the most often

the difference between the largest and smallest numbers in your data set

Create a box and whisker plot from the following set of numbers

18, 18, 20, 13, 17, 12, 15, 12, 17, 19, 17, 18, 18, 20, 11, 19

Step 1: arrange the numbers in order from least to greatest

11, 12, 12, 13, 15, 17, 17, 17, 18, 18, 18, 18, 19, 19, 20, 20

Step 2: find the median of your set of numbers

17.5The lower half of the data

The upper half of the data

11, 12, 12, 13, 15, 17, 17, 17, 18, 18, 18, 18, 19, 19, 20, 20

17.5

list the 5 number summary of your dataThe smallest number (minimum)The median on the left (called the 1st or lower quartile)The medianThe median on the right (called the 3rd or upper quartile)The biggest number (maximum)

11

20

17.513

19

The interquartile range (IQR) is the difference between the third quartile and the first quartile Q3 – Q1

19 – 13 = 6

Step 3: find the median of the lower half of the data

Step 4: find the median of the upper half of the data