Another ride The regression of Duration of a roller coaster ride on the height of its initial Drop, described in Exercise 30, had R 2 = 15.2%.  a) What is the correlation between Drop and Duration?...

Another ride The regression of Duration of a roller coaster ride on the height of its initial Drop, described in Exercise 30, had R²
= 15.2%.

 a) What is the correlation between Drop and Duration?

 b) What would you predict about the Duration of the ride on a coaster whose initial Drop was 1 standard deviation below the mean Drop?

 c) What would you predict about the Duration of the ride on a coaster whose initial Drop was 3 standard deviations above the mean Drop?

Exercise 30

Real estate A random sample of records of home sales from Feb. 15 to Apr. 30, 1993, from the files maintained by the Albuquerque Board of Realtors gives the Price and Size (in square feet) of 117 homes. A regression to predict Price (in thousands of dollars) from Size has an R²
of 71.4%. The residuals plot indicated that a linear model is appropriate.

 a) What are the variables and units in this regression?

 b) What units does the slope have?

 c) Do you think the slope is positive