a. Discuss the methods used in estimation of trend. (6 marks) b. Of 300 business stu

a. Discuss the methods used in estimation of trend. (6 marks)

b. Of 300 business students, 100 are currently enrolled in accounting and 80 are currently enrolled in business statistics. These enrollment figures include 30 students who are in fact enrolled in both courses. What is the probability that a randomly chosen student will be enrolled in either accounting (A) orbusiness statistics (B)? (4 marks)

c. A well-designed and safe workplace can contribute greatly to increased productivity. It is especially important that workers not be asked to perform tasks, such aslifting, that exceed their capabilities. The accompanying data on maximum weight of lift (MAWL, in kg) for a frequency of four lifts/min was reported in the article “The Effects of Speed, Frequency, and

Load on Measured Hand Forces for a Floor-to-Knuckle Lifting Task” (Ergonomics, 1992: 833–843); subjects were randomly selected from the population of healthy males age 18–30. Assuming that MAWL is normally distributed, does the following data suggest that the population mean MAWL exceeds 25?

25.8

36.6

26.3

21.8

27.2

Test the hypothesis test using a significance level of 0.05. (10 marks)

dents, 100 are..