AP Statistics Unit 4
TEST
What happens when you are multiplying each value of a random variable by a
constant? - CORRECT_ANSWER_Multiplies the mean by that constant and the
variance by the square of the constant.
How do you find the sum of means? - CORRECT_ANSWER_The mean of the sum
of two random variables. E(X±Y) = E(X) ± E(Y)
How do you find the difference of the means - CORRECT_ANSWER_The mean of
the difference of two random variables. E(X±Y) = E(X) ± E(Y)
What do we know about the variance if random variables are independent? -
CORRECT_ANSWER_The variance of random variables' sum or difference is always
the sum of the variances. Var(X±Y) = Var(X) + Var(Y)
TEST
What happens when you are multiplying each value of a random variable by a
constant? - CORRECT_ANSWER_Multiplies the mean by that constant and the
variance by the square of the constant.
How do you find the sum of means? - CORRECT_ANSWER_The mean of the sum
of two random variables. E(X±Y) = E(X) ± E(Y)
How do you find the difference of the means - CORRECT_ANSWER_The mean of
the difference of two random variables. E(X±Y) = E(X) ± E(Y)
What do we know about the variance if random variables are independent? -
CORRECT_ANSWER_The variance of random variables' sum or difference is always
the sum of the variances. Var(X±Y) = Var(X) + Var(Y)
