User manual CITIZEN CX-126II

[. . . ] You can use up to 6 levels of parenthes in a single calculation. [ EXP ] Exponent Key To enter a number in scientific notation, first enter the numbers for the mantissa, press [ EXP ], and then enter the numbers for the exponent. [ 2ndF ] [ ] Key Press [ 2ndF ] [] to display the value of , which is the ratio of circle's circumference to its diameter (approximately 3. [ 2ndF ] [ XY ] Register Exchange Key Press [ 2ndF ] [ XY ] to exchange the displayed value (X­register) with the contents of the working register (Y­register). [. . . ] [ a b ], [ 2ndF ] [ d ] Fraction key e c Pressing by [ a b ] can enter a fraction or convert a fraction to a Pressing by [ 2ndF ] [ d ] can convert a mixed e number to an improper fraction and vice versa. [ 2ndF ] [ [X] ]Specify Variable Key Lets you have the calculator wait for an entry during a program. [ 2ndF ] [ HALT ]Temporarily Halt Calculation Key Temporarily halts a program so you can view the intermediate results or interrupt calculation. [ DATA ], [ DEL ] Data Entry and Delete Key In the STAT mode, enter data by pressing the desired numbers, then [ DATA ]. If you enter incorrect data and do not notice your mistake until you press [ DATA ], enter the same incorrect data and then press [ DEL ] to delete that incorrect data. Indicators showed on the display to indicate you the current status of the calculator. : Appears when the second function has been selected. : Appears when you press [SHIFT] [[X]] in the program learn mode and when program execution halts to let you enter a variable. The number in brackets shows the number of the place of the variable, and goes from 1 - 40. Each calculation is performed in the following order of precedence: 1) Functions required inputting values before pressing the function key, for example, cos, sin, tan, cos ­1, sin ­1, tan ­1, log, ln, x 2, 1/x, , , 3 , x!2) Operation in parenthesis 3) Functions required pressing the function key before entering, for example, [ EXP ] key . ] key after the [ = ] key or a fraction Performed with a decimal, the answer is displayed as a decimal. Press [ 2ndF ] [ CAD ] to clear statistical memory before you start a new calculation. Instead of entering directly each data, when often several item of data have the same value, you can enter the value and the number of occurrences. ) : Enter the following data to calculate n, x, x 2, x , n­1, n, where data 1 = 2, data 2~4 = 5, data 5~6 = 9 [ 2ndF ] [ SD ] [ 2ndF ] [ CAD ] 2 [ DATA ] 5 [ DATA ] 5 [ DATA ] 5 [ DATA ] 9 [ DATA ] 9 [ DATA ] ­ or ­ 2 [ DATA ] 5 [ x ] 3 [ DATA ] 9 [ x ] 2 [ DATA ] [n] [ 2ndF ] [x ] [ 2ndF ] [x ] [x] [n­1] [ 2ndF ] [n] Note: The sample standard deviation n­1 is defined as : The population standard deviation n is defined as : The arithmetical mean x is defined as : x n With your programmable scientific calculator, complex repeated calculations are no longer time­consuming chores. All you have to do is tell the calculator what you want to do in a way it can understand (in other word, program it). Your calculator can store one procedure with up to 40 steps. These "steps" can be either steps (like mathematical functions) or characters (like numbers). Procedure even after you turn off the calculator. You can have more than one variable in your calculation. Now enter your procedure as if you were just going to calcualte it once exceptpress [ 2ndF ] [ [X] ] before entering variable data. You get your first answer while you are still in the PGM mode. [. . . ] Stored programs are automatically erased when you press [ 2ndF ] [ PGM ]. So, unless you want to enter a new program, do not select the program mode. You can program your calculator to give you interim values in your formula also. While programming the calculation (in PGM mode), press [ = ] when you reach the point where you want the interim value displayed. [. . . ]