Every few years, the National Assessment of Educational Progress asks national sample of eighth grades to carry out the same math tasks. The goal is to get honest picture in math. Here are the last few national mean scores, on a scale of 0-500
Yr 1990 1992 1996 2000 2003 2005 2008
Score 263 268 272 273 278 279 281
A) Calculate the mean and standard deviation of each variable and their correlation
B) Find the equation of the least square line using your results from a
C) Make a scatter plot and show the year to year variation