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A sample of small cars was selected, and the values of x = horsepower and y = fuel efficiency (mpg) were determined for each car. Fitting the simple linear regression model gave the estimated regression equation
a. How would you interpret b = -.150?
b. Substituting x = 100 gives y = 29.0. Give two different interpretations of this number.
c. What happens if you predict efficiency for a car with a 300-horsepower engine? Why do you think this has occurred?
d. Interpret r2 = 0.680 in the context of this problem.
e. Interpret se = 3.0 in the context of this problem
a certain disease is found in one person in 5000. if a person does have the disease the test will show a positive
A petroleum company intends to drill for oil in four different wells. Use the subscripts 1,2,3,4 to denote the different wells.
Under what conditions is the median a more meaningful measure of central tendency than the mean?- Why do researchers prefer the standard deviation as a measure of variability over the range?
a. Find a 99% confidence interval for the true calcium content of this substance. b. What does the phrase "99% confident" mean? c. What assumptions must you make about the sampling procedure so that this confidence interval will be valid? What does..
The owner of Burger king wishes to compare the sales per day at two locations.- At the 5% significance level, is there a difference in the mean number of burgers sold at the two locations?
Recently the European Community (EC) decided to lower its subsidies to makers of pasta. In deciding by what amount to reduce total subsidies.
Assume that the population standard deviation is 10 mmHg, and nd a 95% con dence interval for , the population mean.
When the experiment is performed many times, the chain ends in state one approximately 20 percent of the time and in state two approximately 80 percent of the time. Compute a sensible estimate for the unknown parameter p and explain how you found ..
For each of the given situations, explain whether the conditions hold for the sampling distribution of P^1 - P^2 to be approximately normal:
What is the probability both will complete on time; that at least one will complete on time; that neither will complete on time?
a particular genetic disease occurs in anyone who has one copy of gene a and two copies of gene b genes a and b are
Averages versus individuals. Scores on the ACT college entrance examination vary Normally with mean µ = 18 and standard deviation s = 6.
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