Advertisements claim that taking an SAT preparation course can significantly
improve performance on the SAT. Assume there are three SAT preparation services available for students to enroll in, and assume you have 200 students available to use in your experiment. Explain the design of an experiment to examine the claim that SAT preparation courses improve SAT scores and, if so, which of the preparation services would seem to be the best.

Association between the variables and yes.

Step-by-step explanation:

Given that researchers recorded the temperatures at The Fashion Mall at Keystone in Indianapolis during 40 random days in November and December 2013, then again in June and July 2014

For these same days, they recorded the mall sales. The correlation coefficient between these variables was -0.884

The test was done and significant at 1% level

a) the correlation coefficient is the strength of association between the two. Here we have strong negative correlation between the two variables.  If correlation coefficient absolute value is nearer to 1, we say strong.

b) Yes .  The lower the temperature the higher is the sales this is because of strong negative correlation.