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Statistical analysis of liquified natural gasoline prices

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The following data represent the price of liquefied natural gasoline (LNG) at self-service stations in four counties in New York City and two suburban counties in a recent week. The data is also included in the Excel spreadsheet Problem C.

Manhattan Bronx Queens Brooklyn Nassau Suffolk
2.339 2.199 2.239 2.259 2.199 2.179
2.299 2.139 2.239 2.199 2.199 2.159
2.239 2.139 2.279 2.359 2.259 2.119
2.299 2.159 2.299 2.259 2.239 2.159
2.319 2.179 2.279 2.319 2.239 2.219

At the .05 level of significance, is there evidence of a difference in the mean price of LNG in the six counties? Which counties are different? Which counties are the best/worst? Perform the appropriate statistical test.

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Solution Summary

This solution conducts a hypothesis test on the mean price of LNG in six countries. All steps are shown in an excel file to determine which countries differ as well as their ranking.

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