Question

Alice wants to prove to her parents that listening to music while she does her homework will help 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.
She did not separ

Answer 1

She did not separate her friends into different groups, and she used a survey to collect data.
She did not use a random sample, and she tried to show cause and effect with an observational study.
She did not use a random sample, and she tried to show cause and effect with an experiment.

Answer 2

Arlene is testing whether school is more enjoyable when students are making high grades. She asked 100 students if they enjoyed school and whether their GPA was above or below 3.0. She found that 30 of the 40 students with a GPA above 3.0 reported that they enjoyed school, and 15 of the 60 students with a GPA below 3.0 reported that they enjoyed school. What is the probability that a student with a GPA below 3.0 does not enjoy school?

15%
25%
45%
75%

Answer 3

The first one is C

Answer 4

@chasepit, the answer to your first question is..........................the mistake she made is she never ask her friend the type of music they listen while reading.

Answer 5

There is a "No Direct Answers" rule. This means that any answer where the asker can pluck out the answer without having to understand anything can be considered a “direct answer”.
For multiple choice, you can help the user by hinting at the correct answer by giving an explanation that uses key terms from the answer, or by leading the asker through the processes of elimination. :) hope this helps ^_^

Answer 6

hint?