3. Research Problem: Job satisfaction as a function of work schedule was investigated in two different factories. In the first factory the employees are on a fixed shift system while in the second factory the workers have a rotating shift system. Under the fixed shift system, a worker always works the same shift, while under the rotating shift system, a worker rotates through the three shifts. Using the scores below determine if there is a significant difference in job satisfaction between the two groups of workers. Work Satisfaction Scores for Two Groups of Workers Rotating Shift 63 71 46 57 53 46 57 76 52 68 32 Fixed Shift 79 83 68 59 81 76 80 74 58 49 Carry out an appropriate statistical analysis using alpha=0.001 a) Which shift is better Rotating Shift or Fixed Shift and Why

2. Management training programs are often instituted to teach supervisory skills and thereby increase productivity. Suppose a university psychologist administers a set of examination to each of 10 graduating students before such training program begins and then administers similar examinations at the end of the program. Examinations are designed to measure supervisory skills, with highest scores indicating increased skills. The results are shown below: Student Before Training After Training 1 63 78 2 93 92 3 84 91 4 72 80 5 TI 65 69 6 72 85 7 91 99 8 84 82 9 71 81 10 80 87 Do the data provide evidence that the training program is effective in increasing supervisory skills, as measured by the examination scores? Use 0.10 significance level. (critical value = +1.383)

A researcher wants to investigate whether single people who own pets are happier than singles without pets. A mood inventory is administered to a group of 20-29 years old non-pet owners and a similar age group of pet owners. The pet owners are also matched one one one with non-pet owners for income, number of close friends, and general health. The data are as follows: Non-pet owner pet owner 10 15 9 9 11 10 11 19 5 17 9 15  is there a significant difference in the mood scores for non-pet owners and pet owners?

10 In the Focus Problem at the beginning of this chapter, a study was described comparing the hatch ratios of wood duck nesting boxes. Group I nesting boxes were well separated from each other and well hidden by available brush. There were a total of 483 eggs in group I boxes, of which a field count showed about 272 hatched. Group II nesting boxes were placed in highly visible locations and grouped closely together. There were a total of 815 eggs in group Il boxes, of which a field count showed about 274 hatched. USE SALT (a) Find a point estimate for p₁, the proportion of eggs that hatch in group I nest box placements. (Round your answer to four decimal places.) p 1= Find a 95% confidence interval for p₁. (Round your answers to three decimal places.) lower limit (b) Find a point estimate 2 for p2, the proportion of eggs that hatch in group II nest box placements. (Round your answer to four decimal places.) upper limit Find a 95% confidence interval for pz. (Round your answers to three…