1. The following table shows the monthly adverting expenditure and sales revenue of a company. You are required to estimate the covariance and correlation coefficient and explain what do these statistics tell you about the relationship between two variables and advice the company.

Sales revenue ($M)	9.6	11.3	12.5	9.5	8.5	12	11.4	12.5	13.8	14.6
Advertising expenditure ($000)	23	40	55	54	28	25	31	36	88	90