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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?
A female offspring has no chance of inheriting the disease. Further suppose that 51.3% of births are male. What is the probability that a randomly chosen child will be affected by the disease?
The amounts were normally distributed with a standard deviation of 10 and 12 for men and women, what is the probability that man will spend at most an hour?
Marketing research has traditionally been associated with manufacturers of consumer goods. Today, we are experiencing an increasing number of organizations, both profit and nonprofit, using marketing research. Why do you think this trend exists? G..
Mauricio Cruz, a wine merchant for Cruz's Spirits Emporium, wants to determine if the average price of imported wine is less than the average price of domestic wine.
What is the probability that none are a commercial success?
What control chart(s) would you use for this data and what are the final control limits?
a salesperson of industrial chemicals has four customers in sacramento whom he might be able to visit on a 2-day trip
Perform hypothesis testing on one variable's data.
box a contains four white marbles and seven black marbles. box b contains five white marbles and six black marbles. an
Think of a case in which regression analysis was used, but not properly. For instance, discuss situations in which regression analysis is not appropriate and does not add useful information to our understanding of a set of data.
Why do we want to assume that our sample data represent a population distribution? What are the differences between the binomial and normal distributions?
If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
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