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A study is conducted the examine the relationship between the number of friends an individual has on Facebook and the grey matter density in the area of the brain associated with social perception and associative memory. The Y (or response/dependent variable) is the number of friends on Facebook. The X (or explanatory/independent) variable is the grey matter density (call this GMdensity) in the relevant region of the brain. Some of the output from the regression model fit in Excel is shown below. Note that some of the entries in the ANOVA table have been deleted. Coefficients Standard Error Intercept 366.64 26.35 GMDensity 82.45 27.58 ANOVA df SS (Sums of Squares) MS (Mean Square) Regression 1 245400.47 245400.47 Residuals ?? 1043545.13 Total 39 1288945.60 Answer the questions below using the output above. No working needs to be shown. What is the total sample size? (In other words, how many people were included in the study?)