A past study claims that the students who have their own cars, spend on petrol RO10.5 per week. A student wanted to check this claim. He took a sample of 10 students and asked them about the money they spend per week on petrol. Their responses are as follows: 11, 10.6, 10.1, 9.1, 9, 15, 12, 10.1, 12, 12.4 Assume that the amount spent on petrol by all students is normally distributed. Using 5% significance level, can you conclude that the weekly spending on petrol by the students has increased?