The following set of data relates mean word length and recommended age level for a set of children's books.
recommended age level - Mean Word Length
4 - 3.5
6 - 5.5
5 - 4.6
6 - 5.0
7 - 5.2
9 - 6.5
8 - 6.1
5 - 4.9
a. Create a scatterplot and classify the linear correlation
b. determine the correlation coefficient
c. determine the line of best fit
d. use this model to predict the average word length in a book recommended for 12 year olds
I'm pretty sure i've figured out that a. is a positive linear correlation. However when it comes to solving the other questions i'm not sure what data to imput into the formulas or what the formula's are. Help with these last questions on which formulas to use to compute the questions would be greatly appreciated!