Amos collected data about population density (in thousand people per square kilometer) and average rent for 1-bedroom apartments in a random sample of 25 cities. Here is regression output on the sample data: Predictor Coef SE coef T P
Constant 812 109.8 7.393 0.000
Density 22.615 4.179 5.411 0.000

S= 262.1 R-Sq= 54.09%

Required:
Calculate a 90% confidence interval for the slope of the least squares regression line?

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling