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Istruzioni per l'uso Casio, Modello 991ES PLUS C

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If this happens, try changing the initial value so they are closer to the solution. • SOLVE may not be able to determine the correct solution, even when one exists. • SOLVE uses Newton’s Law, so even if there are multiple solutions, only one of them will be returned. • Due to limitations in Newton’s Law, solutions tend to be difficult to obtain for equations like the following: y = sin(x), y = ex , y = 'x . Solution Screen Contents Solutions are always displayed in decimal form. Equation (The equation you input.) Variable solved for Solution MathMath (Left Side) – (Right Side) result “(Left Side) – (Right Side) result” shows the result when the right side of the equation is subtracted from the left side, after assigning the obtained value to the variable being solved for. The closer this result is to zero, the higher the accuracy of the solution. Continue Screen SOLVE performs convergence a preset number of times. If it cannot find a solution, it displays a confirmation screen that shows “Continue: [=]”, asking if you want to continue. Press = to continue or A to cancel the SOLVE operation. To solve y = x2 – x + 1 for x when y = 3, 7, and 13 Sf(Y)Ss(=) S)(X)w-S)(X)+1 1s(SOLVE) MathMathMathMathMathMath 3= E-28 Input an initial value for X (Here, input 1): 1= =7== =13== MathMathMathMathMathMath Statistical Calculations (STAT) To start a statistical calculation, perform the key operation N3(STAT) to enter the STAT Mode and then use the screen that appears to select the type of calculation you want to perform. To select this type of statistical calculation: (Regression formula shown in parentheses) Press this key: Single-variable (X) 1(1-VAR) Paired-variable (X, Y), linear regression ( y = A + Bx) 2(A+BX) Paired-variable (X, Y), quadratic regression (y = A + Bx + Cx2) 3( _+CX2) Paired-variable (X, Y), logarithmic regression (y = A + Blnx) 4(ln X) Paired-variable (X, Y), e exponential regression (y = AeBx) 5(e^X) Paired-variable (X, Y), ab exponential regression (y = ABx) 6(A•B^X) Paired-variable (X, Y), power regression ( y = AxB) 7(A•X^B) Paired-variable (X, Y), inverse regression ( y = A + B/x) 8(1/X) Pressing any of the above keys (1 to 8) displays the Stat Editor. Note: When you want to change the calculation type after entering the STAT Mode, perform the key operation 11(STAT/DIST)1(Type) to display the calculation type selection screen. Inputting Data Use the Stat Editor to input data. Perform the following key operation to display the Stat Editor: 11(STAT/DIST)2(Data). The Stat Editor provides 40 rows for data input when there is an X column only or when there are X and Y columns, 20 rows when there are X and FREQ columns, or 26 rows when there are X, Y, and FREQ columns. Note: Use the FREQ (frequency) column to input the quantity (frequency) of identical data items. Display of the FREQ column can be turned on (displayed) or off (not displayed) using the Stat Format setting on the setup menu. E-29 11 11 To select linear regression and input the following data: (170, 66), (173, 68), (179, 75) N3(STAT)2(A+BX) 170 =173=179=ce 66 =68 =75= STATSTATSTATSTATSTATSTAT Important: • All data currently input in the Stat Editor is deleted whenever you exit the STAT Mode, switch between the single-variable and a paired- variable statistical calculation type, or change the Stat Format setting on the setup menu. • The following operations are not supported by the Stat Editor: m, 1m(M–), 1t(STO). Pol, Rec, .R, and multi-statements also cannot be input with the Stat Editor. To change the data in a cell: In the Stat Editor, move the cursor to the cell that contains the data you want to change, input the new data, and then press =. To delete a line: In the Stat Editor, move the cursor to the line that you want to delete and then press Y. To insert a line: In the Stat Editor, move the cursor to the location where you want to insert the line and then perform the following key operation: 11(STAT/DIST)3(Edit)1(Ins). To delete all Stat Editor contents: In the Stat Editor, perform the following key operation: 11(STAT/DIST)3(Edit)2(Del-A). Obtaining Statistical Values from Input Data To obtain statistical values, press A while in the Stat Editor and then recall the statistical variable (.x, .x2, etc.) you want. Supported statistical variables and the keys you should press to recall them are shown below. For single-variable statistical calculations, the variables marked with an asterisk (*) are available. Sum: .x2*, .x*, .y2 , .y, .xy, .x3 , .x2y, .x4 11(STAT/DIST) 3(Sum) 1 to 8 Number of Items: n*, Mean: o*, p, Population Standard Deviation: .x*, .y, Sample Standard Deviation: sx*, sy 11(STAT/DIST) 4(Var) 1 to 7 Regression Coefficients: A, B, Correlation Coefficient: r, Estimated Values: m, n 11(STAT/DIST) 5(Reg) 1 to 5 Regression Coefficients for Quadratic Regression: A, B, C, Estimated Values: m1, m2, n 11(STAT/DIST) 5(Reg) 1 to 6 • See the table at the beginning of this section of the manual for the regression formulas. E-30 • ...