Regression through the origin
Suggest regression through the origin (straight line regression with population intercept know to be zero) with Var(e|x)=x^2sigma^2. The regression model is Y=Bx+e(i=1,...n).
Find an explicit expression for the weighted least squares estimate of B.
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In a study of elephants a researcher wishes to find out the average weight of a certain subspecies of elephants. From previous studies, the standard deviation of the weights of elephants in this subspecies is known to be 1500 pounds.
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The Central Hudson power supply states that it has the target power supply of 120 volts. Using those home voltage amounts, how to test the claim that mean is a 120 volt. Using a 0.01 significance level.
In the past standard deviation of weights of certain 32.0-oz packages filled by the machine was 0.25 oz. A random sample of 21 packages showed the standard deviation of 0.34 oz. Is the apparent raise in variability significant at the 0.10 level of
A chi-square test for independence is called the distribution-free test since the test is based on categorical data rather than on populations that follow any particular distribution. Answer True False
Which of the following isn't a potential solution to the problem that arises when not all expected frequencies are 5 or more in a chi-square test for independence?
Compute a 95% confidence interval for the difference in the average horsepower for engines coming from the two factories and interpret it in context.
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