1.In one of the New York City parks, there has been a problem with muggings in the summer months. A random sample of 10 summer days was selected. The number of cameras in the park (x), and the number of reported muggings on that day (y) were recorded. The data was analyzed to produce the results below:

y=9.78 -0.493x

r2=91.7%

Calculate the correlation coefficient

2.In one of the New York City parks, there has been a problem with muggings in the summer months. A random sample of 10 summer days was selected. The number of cameras in the park (x), and the number of reported muggings on that day (y) were recorded. The data was analyzed to produce the results below:

y=9.78 -0.493x

One interpretation of the slope is:

3.TRUE or FALSE:The correlation coefficient is a number between 0 and 1.

4.Pre-study scores versus post-study scores for a class of 120 college freshman English students were considered. The residual plot for the least squares regression line showed no pattern. The least squares regression line wasy = 0.2 + 0.9xwith a correlation coefficientr = 0.68. What percent of the variation of post-study scores can be explained by the variation in pre-study scores?

5.There is a linear relationship between the number of chirps made by the stiped ground cricket and the air temperature.It was determined that the linear regression model is: y=25.2 + 3.3x where x is the number of chirps per minute andY is the estimated temperature in degrees Fahrenheit.What is the temperature if a cricket chirps 18 times?Round to the nearest degree. Di not include units.

6.There is a linear relationship between the number of chirps made by the stiped ground cricket and the air temperature.It was determined that the linear regression model is:y=25.2 + 3.3xwhere x is the number of chirps per minute andYis the estimated temperature in degrees Fahrenheit.What is the predicted number of chirps made when the temperature is 60 degrees Fahrenheit?Round to the nearest integer.Do not include units.