Typically when a question starts with which that means there are several options to choose from. Or multiple choice. Since you haven't provided that here, I'll tell you how I would estimate it.

50% of 14 is 7

10% of 14 is 1.4

5% of 14 is 1/2 of 10% of 14 which is 0.7

50% + 10% + 5% = 65%

Add them together: 7+1.4+0.7 = 9.1

6 0

2 years ago

Alma wants to prove to her parents that listening to music while she studies for her tests will help her get better grades. She

Nikolay [14]

She asked her friends, which does not represent a random sample.

She tried to show cause and effect without doing an experiment (which includes simple random sample, control group, treatment, etc).

So the answer is she did not use a random sample, and tried to show cause and effect with an observational study.

6 0

3 years ago

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