Aresearcher believes that working out in colder temperatures will burn more calories because a person has to burn more calories to keep warm. the researcher decides to study various groups of people working out at different temperatures and measure their progress. how would you describe the temperature in the study?

a observational

b experimental

c census

d simulation

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?