Stephen runs a pet salon. he is currently grooming 120 dogs per week. if instead of grooming 120 dogs, he grooms 121 dogs, he will add $68.24 to his costs and $66.78 to his revenues. what will be the effect on his profits of grooming 121 dogs instead of 120 dogs? stephen's profits will change by $ nothing. (enter your response rounded to two decimal places.)

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.