1 - Find the mean, mode, median, st.dev., and range of the sample data given below: 14 - 15 - 16 - 12 - 14 - 15 - 14 2 - The amount of time that self-employed Americans work each week is normally distributed with a mean (u) of 44.6 hours and a standard deviation (0) of 14.4 hours. What percentage of self-employed individuals in the United States work between 40 and 60 hours per week? (Round your answer to two decimal places.) 3 - An automotive manufacturer has selected ten car seats to study the Rockwell hardness of the seat recliner mechanism. A sample of 10 seats has an average (X bar) of 44.795 and a standard deviation (s) of 0.402 for Rockwell hardness measurements. At a 95% confidence level, what is the interval for the population mean (x)? (Round your answer to three decimal places.) 4 - Factory ABC is specialized in producing screws. The company wants to calculate the average length of all screws produced (u=population mean). Assume you don't know what the population standard deviation () is. You draw a sample of 30 screws and calculate their mean length. The mean for your sample is 4.8 cm (X bar), and the standard deviation of your sample (s) is 0.4 cm. What is the 95% confidence interval for the population mean? (Round your answer to three decimal places.)