The Smoot-Hawley Act, signed into law in 1930, increased U. S. tariffs to an unprecedented level of 53%, causing a sharp decline in U. S. exports. In 1934, however, changes in the U. S. trade policy enabled U. S. manufacturers to resume business with their foreign distributors. Which of the following is the most likely reason for the increase in U. S. exports after these changes? A. The president received the authority to negotiate bilateral tariff-reduction agreements with foreign governments.
B. The scientific tariff was introduced, which allowed the president to increase tariff levels if foreign production costs were below those of the United States.
C. Congress was given the authority to approve bilateral trade agreements.

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.