Probability. Question 2: Sampling

    0

    #1 Probability. Please provide a spreadsheet and show work.
    A survey of 200 college graduates who have been working for at least 3 years found that 90 owned only mutual funds 20 owned only stocks and 70 owned both.
    #2 Sampling. Please provide a spreadsheet and show work.
    A study of nonfatal occupational injuries in the United States found that about 31% of all injuries in the service sector involved the back. The National Institute for Occupational Safety and Health (NIOSH) recommended conducting a comprehensive ergonomics assessment of jobs and workstations. In response to this information Mark Glassmeyer developed a unique ergonomic handcart to help field service engineers be more productive and also to reduce back injuries from lifting parts and equipment during service calls. Using a sample of 382 field service engineers who were provided with these carts Mark collected the following data:
    Year 1 Year 2
    (Without Cart) (With Cart)
    Average call time 8.27 hours 7.98 hours
    Standard deviation call time 1.36 hours 1.21 hours
    Proportion of back injuries 0.018 0.010
    Find 95% confidence intervals for the average call times and proportion of back injuries in each year. What conclusions would you reach based on your results?

                                                                                                                                      Order Now