A small business is trying to determine the effect of a social media marketing campaign on sales. The plot below shows the relationship between the social media advertising costs and sales revenue. The linear regression output is shown below. 150000 0 A I E 100000 0 . . . Regression Statistics .g 0 . o . ' Multiple R 0.627615 0 g H . s . . , . ' R Square 0.393901 E 50000 ' . - ' Adjusted R Square 0.372254 g ' . '. Standard Error 22633.47 ' Observations 30 20000 1 5000 20000 25000 Social media advertising costs (in dollars) R = Ex: 0.654321 What is the correlation between advertising costs and sales revenue? Weak v correlation