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

The answer is definitely the third one, She did not use a random sample and tried to show a cause and effect relationship with an observational study.

Step-by-step explanation:

I took the test and got it right.

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.

1 is c

2 is a

3 is a

step-by-step explanation: