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A bus company believes that it will need the following numbers of bus drivers during each of the next 5 years: 60 drivers in year 1; 70 drivers in year 2; 50 drivers in year 3; 65 drivers in year 4; 75 drivers in year 5. At the beginning of each year, the bus company must decide how many drivers to hire or fire. It costs $4000 to hire a driver and $2000 to fire a driver. A driver's salary is $10,000 per year. At the beginning of year 1 the company has 50 drivers. A driver hired at the beginning of a year can be used to meet the current year's requirements and is paid full salary for the current year.
a. Determine how to minimize the bus company's salary, hiring, and firing costs over the next 5 years.
Compute mean and standard deviation for sample of N = 8 females and sample of N = 8 for males.
Independent random samples taken at two companies provide the following information regarding the anual salaries of the employees.
The field of statistics can be roughly subdivided into two areas: descriptive statistics and probability.
Compute the relative frequencies and percentages for all classes. Draw a histogram and a polygon for the relative frequency distribution.
If statistically significant, do you think the difference is large enough to be important?
Critically discuss the auto-covariance function of a stationary time series and its basic properties.
A jeweler at Tiffany & Company computes the value of the linear correlation coefficient for pairs of sample data consisting of Tiffany prices for gold wedding rings and the corresponding prices at a discount store.
Kyle averages 7 finished accounts a day. His standard deviation is 2 account per day and we wish the probability that Kyle will finish day with more than 8 finished accounts. Probability will be?
Compute the value of the test statistic. Determine the p-value; and at 93.7% confidence, test the above hypotheses.
A human resources director, on learning about the regression effect, decides to hire people who have been fired by their previous employer for poor performance.
Excess postexercise oxygen consumption (EPOC) describes the energy expended during the body's recovery period immediately following aerobic exercise.
Generate a 95% confidence interval for the difference in mean HDL levels between men when exercise regularly and those who do not.
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