# How do you calculate box plots?

## How do you calculate box plots?

Plot a symbol at the median and draw a box between the lower and upper quartiles. Calculate the interquartile range (the difference between the upper and lower quartile) and call it IQ. The line from the lower quartile to the minimum is now drawn from the lower quartile to the smallest point that is greater than L1.

**Can a TI-84 make a box plot?**

You can use your TI-84 Plus calculator to construct a box plot for your data. Press [2nd][Y=][2] to access Plot2. Follow Steps 1 through 9 for constructing a histogram. In Step 5, select the Box Plot symbol, which looks a bit like a battery turned on its side; see the first screen.

### How do you do a Boxplot on a TI Nspire CX?

Press [MENU]→Plot Type→Box Plot to switch from a dot plot to a box plot. It is cool to watch the points dynamically move and morph into the new plot every time it happens! As you move the cursor over the box plot, each of the values that comprise the five-number summary are revealed.

**How do you know if a box plot is skewed?**

Skewed data show a lopsided boxplot, where the median cuts the box into two unequal pieces. If the longer part of the box is to the right (or above) the median, the data is said to be skewed right. If the longer part is to the left (or below) the median, the data is skewed left.

#### How do you make a box plot on a TI-84 Plus?

Graph the data:

- Press [2nd] [STAT PLOT] [ 1 ].
- Press [ENTER] to turn on the stat plot.
- Select the box plot (the 4th graph type available in the menu) using the right arrow key and press [ENTER].
- Be sure that Xlist is L1.
- Allow Freq to default to 1.
- Color choice is at your discretion.

**Where is stat plot on TI-84?**

The STAT PLOT menu is accessed by pressing the 2ndbutton and the Y = button just below the graphing window.

## How do you tell if data is skewed left or right?

For skewed distributions, it is quite common to have one tail of the distribution considerably longer or drawn out relative to the other tail. A “skewed right” distribution is one in which the tail is on the right side. A “skewed left” distribution is one in which the tail is on the left side.

**How do you determine skewness?**

The formula given in most textbooks is Skew = 3 * (Mean – Median) / Standard Deviation. This is known as an alternative Pearson Mode Skewness. You could calculate skew by hand.