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At Armco's steel plant in Middletown, Ohio, statistical quality-control methods have been used very successfully in controlling slab width on continuous casting units. The company claims that a large reduction in the steel slab width variance resulted from the use of these methods. Suppose that the variance of steel slab widths is expected to be 156 (squared units).
A test is carried out to determine whether the variance is above the required level, with the intention to take corrective action if it is concluded that the variance is greater than 156. A random sample of 25 slabs gives a sample variance of 175. Using α = 0.05, should corrective action be taken?
what do your answers in parts a, c, d, and e imply about diversification?
Are demographic characteristics of community residents related to fear of crime and is the source of news and information about crime on the Gold Coast related community resident's fear of crime?
If the monthly demand for videos on average is 180 and standard deviation = 60, what is the number of videos the manager should order to meet 90% customer demand?
1. What is the probability that McBurgers could provide a meal in less than 4 minutes? 2. What is the probability that McBurgers could provide a meal in more than 5 minutes?
a simple random sample of size n is drawn from a population with a population mean of 59.2 and standard deviation of
In week one you were asked to read/watch the "slide share" show 99 Facts about the Future of Business. Then you were to create a list of five expectations that society has for business leaders from the slide show.
a rock concert producer has scheduled an outdoor concert. the producer estimates the attendance will depend on the
Use differential to approximate square root of 16.3
One of the most famous probability calculations is called the "birthday problem". In probability theory, the birthday problem or birthday paradox concerns the probability that, in a set of n randomly chosen people
The owner hypothesizes that his patrons have no preference for a particular court. He observes how many people play on each court on a particular day.
What results in your departments seem to be correlated or related to other activities? How could you verify this? Create a null and alternate hypothesis for one of these issues. What are the managerial implications of a correlation between these v..
Carry out the suitable calculations to test for effect modification. Interpret your results.
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