4 earthquakes the next cell loads a table containing

This preview shows page 11 - 13 out of 17 pages.

4. Earthquakes The next cell loads a table containing information about every earthquake with a magnitude above 4.5 in 2017, compiled by the US Geological Survey. (source: () ) In [4]: earthquakes = Table() . read_table( 'earthquakes_2017.csv' ) . select([ 'time' , 'mag' , 'place' ]) earthquakes There are a several earthquakes that occurred in 2017 that we're interested in, and generally, we won't have access to this large population. Instead, if we sample correctly, we can take a small subsample of earthquakes in this year to get an idea about the distribution of magnitudes throughout the year! Out[4]: time mag place 2017-12-31T23:48:50.980Z 4.8 30km SSE of Pagan, Northern Mariana Islands 2017-12-31T20:59:02.500Z 5.1 Southern East Pacific Rise 2017-12-31T20:27:49.450Z 5.2 Chagos Archipelago region 2017-12-31T19:42:41.250Z 4.6 18km NE of Hasaki, Japan 2017-12-31T16:02:59.920Z 4.5 Western Xizang 2017-12-31T15:50:22.510Z 4.5 156km SSE of Longyearbyen, Svalbard and Jan Mayen 2017-12-31T14:53:32.590Z 5.1 41km S of Daliao, Philippines 2017-12-31T14:51:58.200Z 5.1 132km SSW of Lata, Solomon Islands 2017-12-31T12:24:13.150Z 4.6 79km SSW of Hirara, Japan 2017-12-31T04:02:18.500Z 4.8 10km W of Korini, Greece ... (6350 rows omitted)
3/18/2021 hw06 Question 4.1. In the following lines of code, we take two different samples from the earthquake table, and calculate the mean of the magnitudes of these earthquakes. Are these samples representative of the population of earthquakes in the original table (that is, the should we expect the mean to be close to the population mean)? Hint: Consider the ordering of the earthquakes table. )) )) )) ))
12/17 Question 4.3. Suppose we want to figure out what the biggest magnitude earthquake was in 2017, but we are tasked with doing this only with a sample of 500 from the earthquakes table. To determine whether trying to find the biggest magnitude from a sample is a plausible idea, write code that simulates the maximum of a random sample of size 500 from the earthquakes table 5000 times. Assign your array of maximums to maximums .
Question 4.2. Write code producing a sample that should represent the population of size 500 then take the mean of the magnitudes of the earthquakes in this sample. Assign these to representative_sample and representative_mean respectively. Hint: In class, what sort of samples can properly represent the population? )) ))

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture