Two new types of petrol, called premium and super, are introduced in the market, and their manufacturers claim that they give extra mileage. Following data were obtained on extra mileage which is defined as actual mileage minus 10. (10 marks) Ordinary Petrol Premium Petrol Super Petrol 1 2 4 3 2 2 1 2 1 2 1 3 3(i) Using ANOVA, test whether premium or super gives an extra mileage. (ii) What is your estimate for the error variance? (iii) Assuming that the error variance is known and is equal to 1, obtain the 95 % confidence interval for the mean extra mileage of super.
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Super petrol would be the right answer I think
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I)no difference between premium and super petrol.
ii)0.888889
iii)4.256495
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