Hurricanes 2017. Exercise 39 considered possible changes in the numbers of tropical cyclones that have grown large enough to be officially named. Regardless of the number of storms, has the fraction of named storms that grew to hurricane strength changed? Here are those fractions for the same periods as those considered in the previous exercise. (Data extracted from Hurricane history)

1997–2006 2007–2017 0.889, 1.000, 0.750, 0.789, 0.882, 0.857, 0.762, 0.882, 0.903, 1.000 0.882, 0.941, 0.818, 0.905, 0.950, 1.000, 0.933, 0.889, 0.917, 0.938, 0.929

a) Write the null and alternative hypotheses.

b) Are the conditions for hypothesis testing satisfied?

c) If so, test the hypothesis.