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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.
Given that we have collected pairs of observations on two variables X and Y , we would consider fitting a straight line with X as an explanatory variable if:
A researcher selected a sample of 50 residents from each of three different cities to determine if they were willing to participate in a medical experiment. At a = .05, test the claim that the proportions who will participate are equal.
A Pew research study recently randomly selected two groups of people, men and women and asked them if they agree with the following statement:
Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone. What is the value of q-hat?
They estimated the proportion of students at the university who prefer outdoor exercise as (0.5745, 0.8217), with 95% confidence. Which of the following is an appropriate interpretation of this confidence interval?
The mean of a set of 7 numbers is 13. What is the sum of the numbers? Find the mode of the following test scores: 89, 78, 91, 82, 75, 89, 84, 95, 89, 93
An advertising agency has been hired by a manufacturer of pens to develop an aqdvertising campaign for the upcoming holiday season. To prepare for this project, the research director decides to initiate a study of the effect of advertising on pro..
How large a sample would be necessary to estimate the population proportion with a margin of error of 0.05 at 95% confidence?
Scientist would like to know if mental health clients of private versus public service agencies differ on Global Assessment of Functioning (GAF) scores and on Satisfaction with Services (Satisfaction). She has collected data for 34 clients from a ..
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
It is impossible to get a negative value for an F -ratio.
Assume a mean wage of $1,000 and standard deviation of $100. What's the probability of finding an employee with a wage of between $790 and $1000?
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