A media psychologist is interested in whether people's overall satisfaction with their life is related to the way they use social media. He gave a standardised life satisfaction survey to a randomly selected sample of 10 people and also recorded how many social media posts they read per day on average.

The data collected by the media psychologist are presented in the table below.

People's life satisfaction levels were measured in scores that could range from 0 (not satisfied at all) to 100 (very much satisfied).

Life satisfaction (X)	X M	ZX	Social media use (Y)	Y M	ZY	(ZX)(ZY)
80			24
74			23
67			21
95			9
70			22
62			20
76			18
67			11
70			16
66			21