HP 33s Scientific manual 16-20Statistics Programs

Program Instructions:

1.Key in the program routines; press ‡when done.

2.Press XS to start entering new data.

3.Key in xi –value (data point) and press g.

4.Key in fi –value (frequency) and press g.

5.Press gafter VIEWing the number of points entered.

6.Repeat steps 3 through 5 for each data point.

If you discover that you have made a data-entry error (xi or fi) after you have pressed gin step 4, press XU and then press gagain. Then go back to step 3 to enter the correct data.

7.When the last data pair has been input, press X G to calculate and display the grouped standard deviation.

8.Press gto display the weighted mean of the grouped data.

9.To add additional data points, press gand continue at step 3. To start a new problem, start at step 2.

Variables Used:

X	Data point.
F	Data–point frequency.
N	Data–pair counter.
S	Grouped standard deviation.
M	Weighted mean.
i	Index variable used to indirectly address the correct
	statistics register.
Register 28	Summation Σfi.
Register 29	Summation Σxifi.
Register 31	Summation Σxi2fi.

Example:

Enter the following data and calculate the grouped standard deviation.

16–20Statistics Programs