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"Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. Unfortunately, the treatment also reduces the strength of the fabric. The breaking strength of untreated fabric is normally distributed with mean 51.6 pounds and standard deviation 1.9 pounds. The same type of fabric after treatment has normally distributed breaking strength with mean 28.7 pounds and standard deviation 1.7 pounds. A clothing manufacturer tests 3 specimens of each fabric. All 6 strength measurements are independent.
(a) What is the probability that the mean breaking strength of the 3 untreated specimens exceeds 50 pounds? 1Your answer was incorrect, but has changed from what was graded.
(b) What is the probability that the mean breaking strength of the 3 untreated specimens is at least 25 pounds greater than the mean strength of the 3 treated specimens?
Henry performed a two-tailed test for an experiment in which N = 24. He could not find his table of t critical values, but he remembered the tcv at df = 13. He decided to complete his obt.with this tcv. Is he more likely to make a type I or II err..
Compute the indicated confidence interval for the differenciate in proportions. Suppose that the samples are independent and that they have been randomly selected.
Compute b1, slope of an OLS regression line using dollars spent as dependent variable (Y) and age as independent variable (X).
Find a 99% confidence interval for the population mean number of weekly miles.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
At a 0.05 level of significance, does this data show that 2 year college students and private unversity students work an equivalent amount of time?
Average of this group is 229. Population standard deviation for both groups is 6. At α = 0.01, is there difference in cholesterol levels between two groups?
A trucking firm suspects that the mean lifetime of a certain tire uses is less than 35,000miles. To check the claim the firm randomly selects and tests 54 of these tires and gets a mean life time of 34,570
Using a 0.01 level of significance, test the claim that the tutoring has an effect on the math scores.
According to the Insurance Institute of America, a family of four spends between $400 and $3800 per year on all types of insurance. Suppose the money spent is uniformly distributed between these amounts.
A marketing firm asked a random set of married and single men as to how much they were willing to spend for a vacation. At = .05, is a difference in the two amounts?
Draw a scatter diagram and consider the correlation for the provided data. Do larger universities tend to have more property crime.
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