Suppose the data shown here are the results of a survey to investigate gas prices. Ten service stations were randomly selected in each city and the figures represent the prices of a litre of unleaded regular gas.

What can we tell about the relative price of gas in the two cities?

Calgary Edmonton 1.029 0.999 1.02 1.026 1.017 1.017 1.002 1.008 0.996 0.99 1.017 1.038 1.014 1.017 1.014 1.032 1.014 1.011 0.983 1.014

Design a test to determine if there is a difference in mean gas prices in the two cities use alpha = .01

Generate a 95% confidence interval estimate for the true mean difference in gas prices in the 2 cities. Does this interval confirm the results from your test above?