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Question: a. What is so special about the least-squares line that distinguishes it from all other lines?
b. How does the least-squares line "know" that it is predicting Y from X instead of the other way around?
c. It is reasonable to summarize the "most typical" data value as having X as its X value and Y as its Y value. Show that the least-squares line passes through this most typical point.
d. Suppose the standard deviations of X and of Y are held fixed while the correlation decreases from one positive number to a smaller one. What happens to the slope coefficient, b?
Calculate the actual profit less the expected profit, and classify this difference by source. For the latter, assume that all expense gains are calculated after the gains from the other sources.
some jobs submitted for processing on a particular cpu have fatal programming errors while others do not. suppose that
State the main points of the Central Limit Theorem for a mean. Why is population shape of concern when estimating a mean? What does sample size have to do with it?"
two airplanes are flying in the same direction in adjacent parallel corridors. at time t 0 the first airplane is 10 km
Using schools as blocks, describe a randomized block design to compare three teaching methods.- Explain why schools should be used as blocks.
Take a deck of cards. A deeck has 52 cards with two major colors(Red and Black), with 26 cards each. Red colors comes in two shapes(heart and diamond)
1. jon works as a sanitation engineer for a zoo. every day he goes to work he feels like he is shoveling a great
the demand for a spare part is three per day according to a poisson distribution. the parts can be obtained from a tool
Fuel economy. A company with a large fleet of cars hopes to keep gasoline costs down and sets a goal of attaining a fleet average of at least 26 miles per.
Suppose we add 120 miles to each error to get an idea of how far from the predicted track we might still find damaging winds.
A meteorologist wishes to estimate the mean amount of snowfall per year in Spokane, Washington. A random sample of the recorded snowfalls for 20 years from a 140 year period produces a sample mean equal to 54.03 inches, with a standard deviation of 9..
What would be the estimated total enrollment for an HMO firm that administered 20 plans? Source: The Wall Street Journal Almanac 1999, p. 565.
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