Casio MS 300M User Guide - Page 8

FX 300 MS Training guide Standard Deviation Use the [MODE] key to enter the Standard Deviation (SD) mode when you want to perform statistical calculations using standard deviation. [MODE] [2] • To clear statistical memory, press [SHIFT] [CLR] [1] [=]. • To enter data, use the following key sequence: [DT] • Input data is used to calculate the following values: Sum of the squares (∑ x2) Sum of data (∑ x) Number of data items (n) Mean of the data Population standard deviation σ n Sample standard deviation σ n-1 [SHIFT] [S-SUM] [1] [SHIFT] [S-SUM] [2] [SHIFT] [S-SUM] [3] [SHIFT] [S-VAR] [1] [SHIFT] [S-VAR] [2] [SHIFT] [S-VAR] [3] Key points to note: • [DT] [DT] inputs the same data twice • You can input multiple entries of the same data using [SHIFT] [;]. To input 100 ten times, press [100] [SHIFT] [;] [10] [DT] • You can scroll through the data you entered using the up and down arrows on the REPLAY button. • You can edit the displayed data by inputting a new value and then pressing the [=] key to replace it. If you use the [DT] key (and not the [=] key), this will register the value you input as a new data item and will leave the old value as is. • If you want to perform statistical calculations, always press the [AC] key first to exit the data display. • To delete a data value that is displayed, press [SHIFT] [CL]. • If you switch to another MODE, you will no longer be able to display or edit your data. 8 References the Casio FX-300 MS User's Guide Casio FX-300MS Scientific calculator