Alice wants to prove to her parents that listening to music while she does her homework will her get better grades. she decides to ask 25 of her friends if they listen to music while they do their homework and what their grades are. she finds that her friends who have high grades also listen to music while they do their homework. she tells her parents that she has proven that listening to music while doing homework will cause her grades to improve. what mistake has alice made?

She did not separate her friends into different groups, and she didn't apply a treatment.

Step-by-step explanation:

Alice decides to ask 25 of her friends if they listen to music while they do their homework and what their grades are.

She finds that her friends who have high grades also listen to music while they do their homework.

She tells her parents that she has proven that listening to music while doing homework will cause her grades to improve.

First of all it cannot be proven like this way.

Secondly, she did not use a random sample, and did not separated  her friends into groups and applied treatment.

So, the answer is She did not separate her friends into different groups, and she didn't apply a treatment.

k

step-by-step explanation:

domit

hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb