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Senior management of a consulting services firm is concerned about a growing decline in the firms weekly number of billable hours. The firm expects each professional employee to spend at least 40 hours per week on work. In an effort to understand this problem better, management would like to estimate the standard deviation of the number of hours their employees spend on work-related activities in a typical week. Rather than reviewing the records of all the firms full-time employees, the management randomly selected a sample of size 51 from the available frame. The sample mean and sample standard deviations were 48.5 and 7.5 hours, respectively. Construct a 99% confidence interval for the standard deviation of the number of hours this firms employees spend on work-related activities in a typical week.
breaking strength in kg of the front part of a new vehicle is normally distributed. in 10 trials the breaking strengths
Calculate the value of a Rs. 5,000 (par value) bond paying interest at an annual coupon interest rate of 10% with 10 years maturity.
you are investigating the role of physical activity in heart disease and suggest that physical activity protects
Would you recommend test- ing H0 : m = 5 versus Ha : m> 5 or H0 : m= 5 versus Ha : m
question suppose that x xijnx2 is an observed data matrix from a bivariate normal distribution nmusigma2i where i is
There is some concern that exposure to gases used in anesthesiology might be harming health of anesthesiologists. In one study of 525 Michigan nurse anesthesiologists, 10 reported a new malignancy other than skin cancer during the previous year.
The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months. What is the minimum and the maximum life expectancy of the middle 95% of the watches?
The data are number of trials to learn to go left at the first turn in a maze for each of their 20 rats. Answer each of the four questions and don't forget to include a verbal statement of your interpretation of the outcomes.
Therefore, probably the next Rose Bowl game will be played in freezing cold weather. Strong or weak? cogent or uncogent?
a particular variety of watermelon weighs on average 23.8 pounds with a standard deviation of 1.35 pounds. consider the
If you choose 12 vehicles at random, what is the probability that more than half(that is, 7 or more) carry just one person?)create a probability distribution table and a cumulative distribution.
trowbridge manufacturing produces cases for personal computers and other electronic equipment. the quality control
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