"green thumb, a manufacturer of lawn care equipment, has introduced a new product. the anticipated demand is normally distributed with a mean of = 100 and a standard deviation of = 40. each unit costs $150 to manufacture and the introductory price is to be $200 to achieve this level of sales. any unsold units at the end of the season are unlikely to be very valuable and will be disposed off in a fire sale for $50 each. it costs $20 to hold a unit in inventory for the entire season. how many units should green thumb manufacture for sale

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.