Chicago public libraries collect data on the number of visitors and the number of library computer wifi sessions. A regression analysis was conducted using yearly totals for 2013. Assume the conditions for the linear model regression model are satisfied. (Source: data.cityofchicago.org)

a. Interpret the slope in context.

b. State the 95% confidence interval for the slope.

c. Based on the confidence interval for the slope, is there a relationship between the number of visitors and the number of library wifi sessions? Explain.

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Simple Linear regression results: Dependent Variable: + wifi results: Independent variable: + Visitors * Wifi sessions = -440092.705 + 0.21811867 + visitors Sample size:12 R(correlation coefficient) = 0.62936487 R-są = 0.39610013 %3D Estimate of error standard deviation:40080.425 Parameter estimates: Parameter Estimate Std. Err. DF 95% L. Limit 95% U. Limit Intercept -44092.705 67254.465 10 -193944.99 105759.58 Slope 0.21811867 0.085167288 10 0.02835417 0.40788321