Question 1
Consider the data set shown below. Find the 95% confidence interval for the slope of the regression line.
◦ 0.94643 ± 0.36203
◦ 0.94643 ± 0.33306
◦ 0.94643 ± 0.28377
◦ 0.94643 ± 0.27603
Question 2
A large national bank charges local companies for using their services. A bank official reported the results of a regression analysis designed to predict the bank's charges (
y), measured in dollars per month, for services rendered to local companies. One independent variable used to predict service charge to a company is the company's sales revenue (
x), measured in $ million. Data for 21 companies who use the bank's services were used to fit the model
E(y) = β0 + β1x.
Suppose a 95% confidence interval for
β1 is (15, 25). Interpret the interval.
◦ We are 95% confident that service charge (
y) will decrease between $15 and $25 for every $1 million increase in sales revenue (
x).
◦ We are 95% confident that service charge (
y) will increase between $15 and $25 for every $1 million increase in sales revenue (
x).
◦ We are 95% confident that sales revenue (x) will increase between $15 and $25 million for every $1 increase in service charge (
y).
◦ We are 95% confident that the mean service charge will fall between $15 and $25 per month.
Biotechnology Companies and Fighting Cancer
Chimpanzees in the Gombe National Park, Tanzania groom each other by holding an overhead branch with
National Ambient Air Quality Standards
Other countries are “Americanizing” their local culture’s diet
Sketch the graph of the following functions using local maximum/minimums, interc