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The article "A Probabilistic Model of Fracture in Concrete and Size Effects on Fracture Toughness" (Magazine of Concrete Res., 1996: 311-320) gives arguments for why fracture toughness in concrete specimens should have a Weibull distribution and presents several histograms of data that appear well fit by superimposed Weibull curves. Consider the following sample of size n = 18 observations on toughness for highstrength concrete (consistent with one of the histograms); values of pi = (i - .5)y18 are also given.
A snack food company that supplies stores in a metropolitan area with "healthy" snack products was interested in improving the shelf life of its tortilla chip product. Determine the upper-tail critical value from the F distribution
a researcher decides to test her hypothesis that some toys are more fun to play with than others so she decides to
The national basketball association calculates many statistics, as do other professional sports organizations.
Captopril is a drug designed to lower systolic blood pressure. When subjects were tested with this drug, their systolic blood pressure readings (in mm of mercury) were measured before and after the drug were taken, with the results given in the ta..
What is the probability that there are less than 500 nails in a randomly selected five pound box of nails?
a random variable x has a probability density function fx 2x for 0 lt x lt 1.find the difference between 10th
In order to evaluate the rate of error experienced in reading chest x-rays, the following experiment is done. Several people with known tuberculosis (TB) status (through other reliable tests) are subjected to chest x-rays.
an april 2004 article on heartheissues.com stated that americans have an average of 2.31 televisions per household. if
A standard deviation of 0.45 miles per gallon, find the probablilty that a car has a gas mileage of between 27.8 and 28.2 miles per gallon.
A researcher conducts some research in which they identify a significant positive correlation (r =0.42) between the number of children a person has and their life satisfaction. Which of the following is it inappropriate to conclude from this resea..
How to determine the sample size for comparing mulltiple parameters like Height , weight, Blood pressure ,Blood parameters like blood glucose, total cholesterol, etc in two different populations?
Suppose a survey item asks someone if something is very important, somewhat important, not very important, or unimportant. This is an example of what level of measurement?
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