The prices of petrol, petrol used, and the distant travelled by a model of sedan car used by six owners are recorded as follows:

Price per liter (RM)	Petrol used (L)	Distant travelled (Km)
2.10	100	1050
2.15	120	1220
2.20	110	1200
2.25	117	1210
2.30	120	1280
2.40	119	1280

1. Plot a scatter diagram to show the correlation between petrol used and distant travelled.
2. Express the relationship between petrol used and distant travelled using a linear model. What does the model suggest?
3. Do a hypothesis test on the coefficient of independent variable using 95% confidence level. What do you conclude?