Filter
Top Products
14
1 : Type takes you back to the first screen in this section of the notes.
2 : Data takes you back to the entered data. This is ideal for checking student data
entries. Data also allows you to insert a score or delete all the scores. Caution! If
you edit or change the data make sure that you press AC to indicate the changes
are complete before you go to any data calculations.
3 : Sum gives the sum of the squares of the scores or the sum of the scores.
4 : Var gives the number of scores, mean, standard deviation and sample standard
deviation.
5 : MinMax gives the smallest and largest score.
You can move backwards and forwards between these options using SHIFT, 1.
Continuing with the example from the previous page
The mean
The screen should be the same as at the bottom of page 13. Press 4 (Var), 2
(for mean) then you must press p to bring up the value of the mean.
The standard deviation
To find the standard deviation, press SHIFT, 1, 4 (Var), 3 for standard
deviation then you must press p to bring up the value.
The mean is 5.9 and the standard deviation is 2.8792 to 4 decimal places.
Entering scores with their frequency
Turn the calculator off to clear then memories. Turn it on then press MODE, select
2 for statistics and 1 for 1-VAR. If there is no frequency column press SHIFT,
SET UP, replay down, 3 (for statistics) then 1 to turn the frequency on.
Example
Scores Frequency
4 9
5 12
6 5
7 2
8 1
Enter all the scores by pressing the value then p. The calculator automatically
makes the frequencies 1. Use the replay button to highlight the frequencies one at
a time then type the appropriate number followed by p.