Question 3 - Shirley's case Shirley 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 (pop 1) and Thursday (pop 2) and recording the prices. Test her claim at the 1% level of significance. Use worksheetK of the Excel Exam data file to answer this question. The null and alternative hypotheses are The decision rule at the 1% level of significance is The p-value for this test is The calculated test statistic is The conclusion to the hypothesis test is