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Exercise

Estimates of the mean interearthquake times

The graphical EDA in the last exercise shows an obvious change in earthquake frequency around 2010. To compare, compute the mean time between earthquakes of magnitude 3 and larger from 1980 through 2009 and also from 2010 through mid-2017. Also include 95% confidence intervals of the mean. The variables dt_pre and dt_post respectively contain the time gap between all earthquakes of magnitude at least 3 from pre-2010 and post-2010 in units of days.

Instructions
100 XP
  • Compute the mean interearthquake time for pre- (dt_pre) and post-2010 (dt_post).
  • Draw 10,000 bootstrap replicates of the mean for the pre- and post-2010 data sets.
  • Use np.percentile() to compute the 95% confidence interval of the mean for both data sets.
  • Hit 'Submit Answer' to print the results to the screen.
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