Sarah, a famous pianist, is told that she will have to undergo brain surgery that could result in partial paralysis of her right arm and leg. Before she enters the hospital, Sarah gives her Steinway piano to a good friend who is also a pianist and has the piano transported to the friend's home. The surgery is successful, and Sarah suffers no paralysis of any kind as a result of the surgery. Can Sarah revoke the gift to her friend? Explain.

Alarge university wanted to study the relationship between completing an internship during college and students' future earning potential. prom the same graduating class, they selected a random sample of 80 students who completed an internship and 100 students who did not complete an internship and examined their salaries five years after graduation. they found that there was a statistically higher mean salary for the internship group than for the noninternship group. which of the following interpretations is the most appropriate? a. there could be a confounding variable, such as student major, that explains the difference in mean salary between the internship and no internship groups.b. we cannot infer anything from these data since the distribution of salaries is likely right skewed.c. you cannot draw any valid conclusions because the sample sizes are different.d. more students should complete internships because having an internship produces a higher salary.