IM using my brothers account with his permission of course and so Im kinda stuck on these questions from 14 a)ii) downwards
14 a. (ii) Substitute the data into the usual formula that is sure to be in your notes and/or textbook.
14 b. Let X be the discrete random variable integers from 1 to 50. You're told that sd(X) = 14.43 => Var(X) = (14.43)^2.
You're expected to know that Var(aX + b) = a^2 Var(X) => sd(aX + b) = |a| sd(X).
(i) a = 1/2, b = 0.
(ii) a = -1, b = 0.
(iii) a = 1, b = 99.
|a| means the magnitude of a.
14 b. (i) The data is given by X/2 therefore sd = 1/2 sd(X) = 1/2 (14.43) = ....
(ii) The data is given by -X therefore sd = |-1| sd(X) = sd(X).
(iii) The data is given by X + 99 therefore sd = sd(X).