Pt 2

6. Given the equation of a regression line is y = 5.6-3.9x, determine whether there is a positive linear correlation or a negative linear correlation. A) positive linear correlation B) negative linear correlation 7. The correlation coefficient between the age and height of children is found to be 0.8. Suppose we use the age of a child to predict the height of a child. Which of the following are appropriate conclusions? A) The least squares line would have a slope of 0.8 B) About 64% of the variation in the child's height is explained by the variation in the child's age. C) About 80% of the time, age will accurately predict height. D) All of the above 8. A sociologist thinks that middle school boys spent more time, on average, studying in 1981 than middle school boys do today. A study was conducted in 1981 to find the time that middle school boys spent studying on weekdays. Recently, another similar study was performed. What are the appropriate null and alternative hypotheses to test the sociologists claim? Ho : Ha : * *space intentionally left blank; please proceed to the next page