Notice there are no values in the data set that are 3.95 cm or below. That means there are no unusually low values in the data set. There is one value in the data set that is 9.55 cm or higher. It is the maximum value of the data set 10.4 cm. Therefore, 10.4 cm is an unusually high value in the data set. We need to designate that value as an outlier (unusual). Some people like to draw their outliers with a circle, some draw it with a triangle, and some draw it with a star. I will draw it with a triangle. Now we need to determine where to draw the whiskers. The whiskers are drawn to the highest and lowest numbers in the data set that are not outliers (not unusual). Be careful. The whiskers are not drawn to the unusual cutoff fences. They must be drawn to numbers that are actually in the data set and are not outliers. was no unusually low value in the data set. Therefore, the low whisker on the left should be drawn to the smallest number in the data set, which is 4.7 cm. was an unusually high value (outlier) at 10.4 cm. That means we cannot draw the whisker to that value. We must choose a new maximum value in the data set that is not an outlier. Looking at the dot plot, we see that the next biggest number in the data set was 7.8 cm. That is 9.55 cm or below so it is not unusual. We will draw the high whisker (on the right) to 7.8 cm since that is the largest number in the data set that is not an outlier (not unusual). The whiskers probably get their name because they kind of look like cat whiskers. This is our complete box plot. Creating Box Plots with Technology Let us look at how to create box plots with Statcato. Making a box plot in Statcato: Graph => Histogram => Pick a column => Chose whether you want the graph horizontally or vertically => OK Right click on the graph and push out” and then axis” to see “zoom “range unusual values (outliers)
Notice there are no values in the data set that are 3.95 cm or below. That means there are no unusually low values in the data set. There is one value in the data set that is 9.55 cm or higher. It is the maximum value of the data set 10.4 cm. Therefore, 10.4 cm is an unusually high value in the data set. We need to designate that value as an outlier (unusual). Some people like to draw their outliers with a circle, some draw it with a triangle, and some draw it with a star. I will draw it with a triangle. Now we need to determine where to draw the whiskers. The whiskers are drawn to the highest and lowest numbers in the data set that are not outliers (not unusual). Be careful. The whiskers are not drawn to the unusual cutoff fences. They must be drawn to numbers that are actually in the data set and are not outliers. was no unusually low value in the data set. Therefore, the low whisker on the left should be drawn to the smallest number in the data set, which is 4.7 cm. was an unusually high value (outlier) at 10.4 cm. That means we cannot draw the whisker to that value. We must choose a new maximum value in the data set that is not an outlier. Looking at the dot plot, we see that the next biggest number in the data set was 7.8 cm. That is 9.55 cm or below so it is not unusual. We will draw the high whisker (on the right) to 7.8 cm since that is the largest number in the data set that is not an outlier (not unusual). The whiskers probably get their name because they kind of look like cat whiskers. This is our complete box plot. Creating Box Plots with Technology Let us look at how to create box plots with Statcato. Making a box plot in Statcato: Graph => Histogram => Pick a column => Chose whether you want the graph horizontally or vertically => OK Right click on the graph and push “zoom out” and then “range axis” to see unusual values (outliers)