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If one machine is purchased and demand is low, the net present value is $120,000. If demand is high, the manager has three options. Doing nothing has a net present value of $120,000; subcontracting,
Assume that the conditions for correlation are met. Is the following statement true or false? If it is false, explain. A correlation of 0.89 indicates a strong, position association.
If a sample of 25 boxes is randomly chosen, what is the probability that the mean will be less than 15.3 ounces? If you were in charge of filling the boxes and the sample of 25 boxes that you chose
Calculate a 99% confidence interval for the mean surface roughness of coated interior pipe. Would you expect the average surface roughness of all pipes to be as high as 2.5? Explain.
An instructor gives his class a set of 13 problems with the information that the next quiz will consist of a random selection of 3 of them. If a student has figured out how to do 9 of the problems,
What is the probability that exactly one of the computers will be defective? What is the probability that at least one of the computers selected is defective?
Two airplanes are flying in the same direction in adjacent parallel corridors. At time t = 0, the first airplane is 10 km ahead of the second one. Suppose the speed of the first plane (km/hr) is nor
Manufacture of a certain component requires three different machining operations. Machining time for each operation has a normal distribution, and the three times are independent of one another.
The national high school sports database reports that players of lacrosse average 55 goals per season. The standard deviation for goals per season is 22. To qualify for the national Junior Olympics
If you wanted to calculate the "average" percentage of people with advanced degrees across all states, would you report a mean, median or mode?
Explain why this number is so much larger than the average number of goals made. Also explain how you use the table from the back of the book to arrive at this answer.
A cognitive psychologist would like to evaluate the claim that the omega-3 fatty acids in fish can help improve memory in normal adult humans. One group of participants is given a pills containing a
If the correlation between two variables is known to be statistically significant at the 0.05 level, then the regression slope coefficient will also be significant at the 0.05 level.
Line A produces 30% of the plants output , whereas line B produces 45% and C poduces 25%. of te output If a samle n=100 bearings is inspected that sample and found one defective bearing, what is the
If it is known that a simple linear regression model explains 56 percent of the variation in the dependent variable and that the slope on the regression equation is negative, then we also know that
A research study has stated that the taxes paid by individuals is correlated at a .78 value with the age of the individual. Given this, the scatter plot would show points that would fall on straight
A May 2007 Gallup Poll found that only 11% of a random sample of 1003 adults approved of attempts to clone a human.
A manufacturing company is interested in predicting the number of defects that will be produced each hour on the assembly line. The managers believe that there is a relationship between the defect r
Every Normal model is defined by its parameters: the mean and the standard deviation. Suppose that the mean ?= 20, and that 45% of the area is above 30. What is the standard deviation?
In the Normal model N(100,16) for IQs, what cutoff value bounds the highest 5% of all IQs?
Peters Ittig's department store, Ittig brothers, is Amhert's largest independent clothier. The store receives an average of 10 returns per day. Using z=3 the control limits are: The type of control
Given independent random variables with the means and standard deviations below, find the mean and standard deviation of the following random variable: X+2Y
A study of 24 graduates of four-year colleges revealed the mean amount owed by a student in student loans was $14,381. The standard deviation of the sample was $1,892. Construct and explain a 90% co
What is the shape, mean(expected value), and standard deviation of the sampling distribution of the sample mean for samples of size 40?
Why does a researcher want to go from a normal distribution to a standard normal distribution?