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A researcher is studying the effects of humidity on food consumption by rats. A group of 100 rats is housed in a controlled environment and the researcher measures the amount of food consumed by each rat with humidity set at 20% and again with humidity set at 60%. For this study, identify (a)the population and (b) the sample.
Explain what property associated with the Central Limit Theorem you consider the most important contribution, enabling the use of the normal distribution for sample means.
For one of the first statistics exam, the coefficient of determination between hours studied and the grade earned was 80 percent. The standard error of estimate was 10.
Commonwealth Edison wants to identify its heaviest users, which are those that are in the top 6% of electric consumption. How many kilowatt hours in January would qualify for the heavy user classification?
Suppose that the population follows the normal distribution. Forty trucks are randomly selected and weighed. Within what limits will 95 percent of the sample means occur?
Find the probability that not enough seats will be available. Is this probability low enough so that overbooking is not a real concern?
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study and gender differences were also to be investigated. One of the variables measured was the heart rate after..
Make a forecast for 2004, using either the fitted trend model or a judgment forecast. Why is it best to ignore earlier years in this data set?
Joe is considering pursuing an MBA degree. He has applied to two different universities. The acceptance rate for applicants with similar qualifications is 25% for University A and 40% for University B.
Given the variances of the two samples below, find the test value and the degrees of freedom that should be used in an F test.
An issue that faces individuals investing for retirement is allocating assets among different investment choices. A study conducted 10 years ago showed that 65% of investors preferred stocks to real estate as an investment.
Assuming a linear cost relationship, what are the regression coefficients, b0 and b1?
We have a deck of 52 playing cards. What is the probability of drawing?
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