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A sample of four tires is taken from a lot of brand-A tires. Another sample of four tires is taken from a lot of Brand-B tires. These tires are tested for amount of wear, for 24,000 miles of driving on an eight-wheeled truck, when the tires are rotated every 1000 miles. The tires are weighted before and after the test. The loss in weight, expressed as the percentage of initial weight, is used as a measure of wear. For the sample of brand-A tires:
it is found that X-bar_A=18.0, S_A=1.3 ;
for brand-B tires, X-bar_B=19.4, S_B=1.5.
Assuming (approximately) normal distributions having equal variances for percent wear of tires of each brand under these test conditions, find a 95% confidence interval for \(\mu_{A}-\mu_{B}\)
A company that manufactures computer chips wants to use a multiple regression model to study the effect that different variables have on y, the total daily production cost
Show some work for each part. A diagram can be helpful. A survey of adults found the following: 65 percent of the adults drink coffee. 35 percent drink tea. 80 percent drink coffee or tea (or both). If we choose a surveyed adult at random, find t..
there are 3 coins in a box. one is a two-headed coin another is a fair coin and the third is a biased coin that comes
Parole board is examing five prisoners up for parole. let x= number of prisoners out of 5 on parole who become offenders. Find the probability distribution for x.
A random sample of 100 peaches is gathered and the mean diameter is calculated. What is the probability that the sample mean is greater than 3.79 inches.
q1. through years of careful observation you have begun to suspect that how vocal cats are is somehow related to the
a study of the attendance at the university of alabamas basketball games revealed that the distribution of attendance
Suppose that blood chloride concentration
For the period from 1918 to the present, in a random sample of 13 wolves spotted in the region, what is the probability that 10 or more were male? What is the probability that 10 or more were female?
The weight of children in the U.S. are normally distributed with a mean of 8.0 pounds and standard deviation of 1 pound
Graph these data to see whether a linear equation might describe the relationship between the group's television shows and guitar sales and use the least-squares regression method to derive a forecasting equation.
a population has a mean of mu 30 and a dtadard deviation of 5. if 5 points were added to every score in the population
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