User manual LEXIBOOK SC460

[. . . ] Notations utilisées dans le manuel Dans ce manuel les fonctions seront indiquées comme suit : Principale [sin] Seconde [SHIFT] [sin-1] Alpha [ALPHA] [D] Les calculs et les résultats seront présentés comme suit : description saisie -> ligne alphanumérique | ligne résultat Ex : [(] 4 [+] 1 [)] [x] 5 [=] -> (4+1)x5= | 25. Scientific calculator with two line display, trigonometric functions, one variable statistics, sexagesimal calculations. It is with great pleasure that we welcome you amongst the many users of Lexibook® products and we thank you for the trust you place in us. For over fifteen years now, the French company, Lexibook, has been creating, developing, producing and distributing worldwide, electronic products renown for their technological standard and their high production quality. [. . . ] Used with [Pol(] or [SHIFT] [Rec(], it is placed between x and y, or r and 0 to indicate the input of the ème coordinate. As a reminder : x = rcos 0 y = rsin 0 and r = (x+y) 0 = tan-1 (y/x) x and y are cartesian coordinates, or rectangular coordinates, and r and 0 are polar coordinates. Note: the angle 0 will be calculated in the interval [-180º, +180º] (decimal degrees) ; the angle measurement of 0 will be given in the angle unit mode set on the calculator : in degrees if the calculator is in the Degree mode, in radians if the calculator is in Radian mode etc. The coordinates are stored in the temporary memories E and F after conversion; like the other temporary memories, they can be recalled at any time and used in other calculations. 211102551 The calculator immediately displays the result for the first coordinate, r= 7. 32623792 The calculator immediately displays the result for the first coordinate, x= 11. Each data is made up of a value (one variable x) or two (two variables x and y). We look to calculate the average of these values and the breakdown of these values around the average, the standard deviation. When there are two variables we try to find a link in the data provided between x and y. The validity of this hypothesis is confirmed in the following calculation: The result is always between ­1 et +1 and a result greater than or equal to 3/2 in absolute value is considered true. Your calculator allows you to obtain these results easily by carrying out the following steps: · Check that the value of n corresponds to the number of data that you have theoretically input. Indicates the number of samples input (n), in other words, the number of data entered. One variable statistics ­ Practical example Practical Example Benjamin and his friends obtained the following results in their French test: student A marks 8 B 9. Average and sample standard deviation for Benjamin's marks as well as those of his friends?]5 [DT] 15 [DT] We display n and check that the number displayed corresponds to the number of values inputted: [SHIFT][S-SUM] 3 [=] -> n | 10. We take up the same experience with the maths exam in which the students obtained the following notes: student A marks 4 B 7. -> n= | 1 beginning of data entry -> n= | 2 -> n= | 4 to enter same amount twice. We notice that the mean is the same but that the standard deviation is greater this time: we can thus conclude that there is a greater variance between the students' marks and that their standard is less homogenous in math than in French. As an exercise, in this example (using the mathematics marks) the following values are obtained for x and x : [SHIFT] [S-SUM] 2 [=] -> 115. After having chosen the REG mode (by entering [MODE]3) you have the following options: Lin 1 Log 2 Exp 3 Pwr 1 Inv 2 Quad 3 You can input data into your calculator in the same way, irrespective of the type of regression selected at the start. Your calculator actually carries out the necessary modifications itself during data input. You will only need to take these modifications into account when you display the various amounts. [. . . ] Only reactivate the calculator for the following reasons: · In extreme conditions or when the keys are no longer working. handling Precautions · Never attempt to take the calculator apart as it is made up of precision components. Avoid use and storage in areas subjected to large amounts of humidity, dust and high temperatures. A very cold environment may cause the calculator's responses to slow down or cause the calculator to shut down altogether. [. . . ]