In this exercise you will use the Correlation and Regression applet to make scatterplots with 10 points that have correlation close to 0.7. The lesson here is that many patterns can have the same correlation. Always plot your data before you trust a correlation. (a) Stop after adding the first two points. What is the value of the correlation? (Enter your answer rounded to four decimal places). Why does the correlation have this value? Two is less than the minimum number of data points needed to calculate correlation. This value is the default correlation. Because two points determine a line, the correlation always has this value. The mean of two points always has this value.

You generate a scatter plot using Excel. You then have Excel plot the trend line and report the equation and the r value. The regression equation is reported as y = – 17.55x + 59.45 and the r? = 0.0081. What is the correlation coefficient for this data set? r =

Please explain simply. Thanks.

Let x be the average number of employees in a group health insurance plan, and let y be the average administrative cost as a percentage of claims. x 3 7 15 32 75 y 40 35 30 26 18 (a) Make a scatter diagram of the data and visualize the line you think best fits the data.  Flash Player version 10 or higher is required for this question. You can get Flash Player free from Adobe's website.   (b) Would you say the correlation is low, moderate, or strong? positive or negative? strong and negative moderate and negative   strong and positive low and negative low and positive moderate and positive (c) Use a calculator to verify that Σx = 132, Σx2 = 6932, Σy = 149, Σy2 = 4725, and Σxy = 2997. Compute r. (Round your answer to three decimal places.)r =  As x increases, does the value of r imply that y should tend to increase or decrease? Explain. Given our value of r, we cannot draw any conclusions for the behavior of y as x increases. Given our value of r, y should tend to…