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Suppose that the random variable X represents the length of a punched part in centimeters. Let Y be the length of the part in millimeters. If E(X) = 5 and V(X) = 0.25, what are the mean and variance of Y?
the data in table are diameters in mm of holes in a group of 12 wing leading edge ribs for a commercial transport
Her results (in hours until turning a particular shade of brown) are in the table below. At ∞= .01, did she see a difference between the two treatments?
A sample has just been taken with the following lengths: 21.25, 22.0, 21.5, 20.75, 21.25, 21.35, 21.35, 21.35, 21.35, 21.35, 21.35, and 21.35. Is the new seamstress performing at an acceptable quality level?
What is the margin of error? What is the 95% confidence interval for the proportion of the population of employees who strongly dislike their current work experience?
Calculate the exact probability of arrangement occurring by chance assuming that males and females are equally likely to be promoted.
in constructing a confidence interval for a mean with unknown variance with a sample of 25 items bob used z instead of
One group was enquired, questions what they saw. One group was enquired, "About how fast were cars going when they smashed into each other?"
As a test the truck company purchases a random sample of metal parts from Steel-R-Us, and then determines if these parts were delivered on-time. Which hypotheses should they test?
Would he be justified in concluding that walking slowly may cause high cholesterol or that high cholesterol may influence walking speed? Explain why or why not.
1.a college basketball player makes 80 of his free throws. at the beginning of a game he misses his first two free
A test of 45 capsules had a mean weight of 20.9 milligrams and a standard deviation of 0.3 milligrams. Test the makers claim at the 95% confidence level.
Explain how significance is determined in simple terms as well and define a statistical interaction and how it affects your results. Give an example. List the variables that are interacting and why.
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