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. Two variable statistics ­ practical example . 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. [. . . ] 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. brackets ending the input of the pair of coordinates. Displays the first coordinate after conversion, x or r. Displays the second coordinate after conversion, y or 0 . 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. This data is calculated in the following way: x = x1+x+x+. 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. Allows you to edit data input errors before having pressed [DT]. Allows you to edit data input errors after having pressed [DT]. 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. [. . . ] Once the temperature becomes milder, the calculator will once again function normally. Avoid all contact with water or other liquid substances as this may cause a short circuit in the calculator resulting in a fire hazard. Take care not to splash water on the calculator. Avoid using chemical liquids or spirits to clean the machine. [. . . ]