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Z test for two populations: Hurricanes that strike the US

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From 1990-1998 there were 68 Atlantic hurricanes, or which 19 struck the US. From 199-2006 there were 70 hurricanes, of which 45 struck the US. Does this evidence convince you the percentage of hurricanes that strike the US is increasing?

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Solution Summary

The solution provides step by step method for the calculation of Z test for two populations. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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