Question 1 - Shirley's case

Shirley the disgruntled motorist is sure that the average price of petrol has been over 165 cents per litre in the local area so conducts a survey of prices from local petrol stations. Is there enough evidence to support her claim at the 5% level of significance? Use worksheet I of the Excel Exam data file to answer this question.

a) The null and alternative hypotheses are

b) The decision rule at the 5% level of significance is

c) The p0value for this test

d) the calculated statisitic for this hypothesis test is

e) conclusion for the test

Data:

Price

150

145

152

162

146

144

150

157

154

161

163

170

161

155

152

143

142

155

154

150

180

210

195

188

178