Question: Cramming. One Thursday, researchers gave students enrolled in a section of basic Spanish a set of 50 new vocabulary words to memorize. On Friday the students took a vocabulary test. When they returned to class the following Monday, they were retested-without advance warning. Here are the test scores for the 25 students.
a) What is the correlation between Friday and Monday scores?
b) What does a scatterplot show about the association between the scores?
c) What does it mean for a student to have a positive residual?
d) What would you predict about a student whose Friday score was one standard deviation below average?
e) Write the equation of the regression line. f) Predict the Monday score of a student who earned a 40 on Friday.