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The primary property of the alloys used for teeth filling is the percent of shrinkage on driving. For a certain alloy 45 test specimens showed an avarage shrinkage percentage of 18.4 and a variance of 1.44.
a) Estimate the true avarage percentage of shrinkage for specimens of this type in 98% confidence interval.
b) How large a sample size is necessary if the length of 98% interval is to be 0.4?
Explain the process of factoring a trinomial with a leading coefficient that is not equal to one. Why is this process more difficult than when the leading coefficient is equal to one? Give an example. How could we apply FOIL in this context?
As the correlation coefficient increases from 0.85 to 0.88, do the points of the scatter plot move toward the regression line, or away from it?
What is the probability that the debt for a borrower with good credit is more than $18,000?
the data represent the number of driving fatalitites for a certain area by age for male and female drivers.
A researcher hypothesizes that the variation in the amount of money spent on business dinners is greater than the variation of the amount of money spent on lunches. The variance of nine business dinners was $6.12 and the variance of 12 business l..
At a large commercial bakery, one of the measures familiar with evaluate employees is the number of broken cookies per 1000 produced. The quality control department wants to determine if there is a relationship between years of experience and bro..
Random sample with a normal distribution with a mean of 60,000 and standard deviation of 2300. What warranty should the company us if they want 96% of the tires to outlast the warranty?
Describe a political poll or survey. Analyze the number of people who participated in the sample compared to the number in the population and discuss how the results of the survey can be used to tell a story or support an idea of the sponsoring comp..
What is the probability that at least one left-handed student in this class is forced to use a seat designed for a right-hander?
A thorough examination reveals there is nothing wrong with the filling machine. From a statistical standpoint,was there a type error made? If yes, which type? Explain?
There are 3 radar stations and the probability of a single radar station detecting an enemy plane is 0.65. What is the probability of 2 stations detecting an enemy plane? Round your answer to nearest hundredth.
For each of the given population would the score of X=50 be considered central score (near middle of distribution) or extreme score (far out in the tail of the distribution )?
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