The data below gives the mean price (in cents) of a litre of regular gasoline at self-service filling stations at a sample of six urban centres in Canada in May 2010. Urban area Price/litre Halifax 105.4 Thunder Bay Winnipeg Calgary 109.2 98.8 94.9 Victoria 109.7 Whitehorse 112.5 Provide answers to the following to two decimal places. Part (a) Find the sample mean (in cents). Part (b) Find the sample standard deviation (in cents). Part (c) Using the appropriate t distribution, find a 90% confidence interval for the mean gasoline price per litre across urban Canada in May 2010. Provide the upper and lower bounds for your confidence interval. ( Part (d) Would a 95% confidence interval be wider or narrower than the interval you found in Part (c)? Using the appropriate t distribution, find a 95% confidence interval for the mean gasoline price per litre across urban Canada in May 2010. Provide the upper and lower bounds for your confidence interval. (

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