Answer:
You will need to find what a and ba stand for like what number equals to a or ba
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.
5/6 + 3/8
Convert to denominators of 24:
20/24 + 9/24
Add the numerators:
29/24
Convert to mixed number:
1 5/24