It has been suggested that global climate change may be affecting the frequency of tropical storms. The data here show the number of tropical cyclones (including hurricanes) assigned official names by the National Hurricane Center. Is there evidence of a change?

a) Write the null and alternative hypotheses.
b) Are the conditions for hypothesis testing satisfied?
c) If so, test the hypothesis.

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1995-2001 2002-2012 19, 13,7, 14, 12,14,152, 16, 15, 27,9, 15, 16, 9, 19, 18, 19