Carol also believes that petrol stations systematically increase the price of petrol on Thursdays. She collects a sample of data by visiting the same petrol stations on a Tuesday (population 1) and Thursday (population 2) and recording the prices. Test her claim at the 5% level of significance.Useworksheet Gof the Excel Exam data file to answer this question.

The hypothesis to be tested is

H0: D ? 0; H1: D > 0, where D = 1 - 2H0: 1 - 2 ? 0; H1: 1 - 2 0

The decision rule at the 5% level of significance is

a)Reject H0 if t 1.645. d)Reject H0 if t > 2.94

The p-value for this test is

A)0.05

B)0.0197

C)0.0099

D)-

Station Tuesday Thursday 139 138 2 141 157 3 140 142 4 136 145 5 139 141 6 136 140 7 145 148 8 138 141 9 135 138 10 145 147