Question 1

1 / 4 pts

We graphed data from the National Center of Education Statistics and found a strong linear form for X = years from 1990 and Y = number of school crimes (in millions). The data spanned the years 1990 to 2006.

The least squares regression line is Y-predicted = 4.14 - 0.18X.

Which of the following is a valid interpretation of the slope?

For each year after 1990 the number of school crimes is predicted to decrease by 180,000 (0.18 million). [ Select ] ["invalid", "valid"]

For each additional year after 1990 the number of school crimes is predicted to increase by 4.14 million. invalid

Which of the following is a valid interpretation of the y-intercept?

The y-intercept does not have a valid interpretation because it is negative. [ Select ] ["invalid", "valid"]

The actual number of school crimes in 1990 was 4.14 million. [ Select ] ["invalid", "valid"]

Answer 1:

invalid

Incorrect. The slope is -0.18million, which is the predicted decrease in school crimes per year after 1990.

Answer 2:

invalid