An economy consists of three workers, larry, moe, and curly. each works ten hours a day and can produce two services: mowing lawns and washing cars. in an hour, larry can either mow one lawn or wash one car; moe can either mow one lawn or wash two cars; and curly can either mow two lawns or wash one car. scenario 1: all three spend all their time mowing lawns. then lawns will be mowed and cars will be washed. scenario 2: all three spend all their time washing cars. then lawns will be mowed and cars will be washed scenario 3: all three spend half their time on each activity. then lawns will be mowed and cars will be washed. scenario 4: larry spends half his time on each activity, while moe only washes cars and curly only mows lawns. then lawns will be mowed and cars will be washed. exactly one of the scenarios above is inefficient. that is scenario

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.