Anumber of art museums around the countts, have been featuring work by an artist named mark lombardi (1951-2000), consisting of a set of intricately rendered graphs. building on a great deal of research, these graphs encode the relationships among people involved in major political scandals over the past several decades: the nodes correspond to partici- pants, and each edge indicates some type of relationship between a pair of participants. and so, if you peer c! osely enough at the drawings, you can trace out ominous-looking paths from a high-ranking u. s. govern- ment official, to a former business partner, to a bank in switzerland, to a shadowy arms dealer.

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.