Brand 1       Brand 2         7.9 10.1 7.4 9.3 5.7 8.8 4.5 6.4 7.2 6.2 9.6 5.3 6.8 7.5 7.4 5 6.9 4.9 6.6 6.8 6.1 9.5 9.8 6.4 7.2 8.3 5.7 8.6 7.5 7.9 7 6.1 7.1 8.3 5.7   8.9 5 8.2 4 8.4 7.9 7.1 6.8   Using the data above a.Conduct a hypothesis test at a significance level of 5% to see if there is a statistically significant difference in the average oil levels between Brand 1 and Brand 2. b. If the manufacturers of brand 1 assert that their product has a higher average oil content than brand 2, test at the 5% level of significance, whether their claim can be supported by the sample evidence