Define positive and negative correlation. What are the required assumptions for correlation analysis? A data analytic company wants to find the relation between traffic in website (X) per day and server downtime (Y) in minutes per day. The collected data are:

X	9	10	12	9	10	13	13	19
Y	26	38	27	45	55	80	84	100

(i) Find the correlation coefficient between x and y. Interpret the value.
(ii) Find the regression equation of y on x. Estimate the value of y when x = 16.
(iii) Interpret the value of y-intercept and slope of the line.