Psy/300 Week 3 Quiz Analysis
Exercises
Open the ex_6.mxd map document in the MapDocuments folder of the mgisdata directory and answer the following questions.
1. (a) Recalculate the earthquake statistics without the missing data values and compare the results to the values reported in Figure 6.8.
(b) Perhaps many quakes have missing magnitude values because they occurred before 1960, when seismic networks for measuring magnitudes were not yet common. Test this hypothesis and report what you find.
(c) Examine the quake magnitudes on a map and propose an explanation for why the smaller quakes (magnitude less than 4) were included in the data set. (Hint: Use the query expression
MAG > 0 AND MAG < 4.)
2. How many counties in the United States have the name Washington? …show more content…
Which state has the largest percentage of African Americans?
4. Which subregion of the country has the greatest number of African Americans? How many does it have?
5. Add the table dating from the mgisdata\Usa\usdata geodatabase to the map document. This table contains information about marital status by county. Examine the table. Which fields could you use to join this table to the US Counties table? Why would the county name field NOT work? In the US Counties table, examine the three fields STATE_FIPS, CNTY_FIPS, and FIPS.
How are these fields related? Join the tables.
6. Join the dating table to the US Counties table. Then select the counties that lost population in the 20-year period from 1990 to 2010. How many are there? In what area of the country are these counties predominantly located? Make a map showing the “losing” counties. Capture the map. (Hint: Create a new layer from the selected features.) 7. Use Summarize to determine the number of counties in each state that lost population. Which three states had the most losing counties, and how many losing counties did each
Open the ex_6.mxd map document in the MapDocuments folder of the mgisdata directory and answer the following questions.
1. (a) Recalculate the earthquake statistics without the missing data values and compare the results to the values reported in Figure 6.8.
(b) Perhaps many quakes have missing magnitude values because they occurred before 1960, when seismic networks for measuring magnitudes were not yet common. Test this hypothesis and report what you find.
(c) Examine the quake magnitudes on a map and propose an explanation for why the smaller quakes (magnitude less than 4) were included in the data set. (Hint: Use the query expression
MAG > 0 AND MAG < 4.)
2. How many counties in the United States have the name Washington? …show more content…
Which state has the largest percentage of African Americans?
4. Which subregion of the country has the greatest number of African Americans? How many does it have?
5. Add the table dating from the mgisdata\Usa\usdata geodatabase to the map document. This table contains information about marital status by county. Examine the table. Which fields could you use to join this table to the US Counties table? Why would the county name field NOT work? In the US Counties table, examine the three fields STATE_FIPS, CNTY_FIPS, and FIPS.
How are these fields related? Join the tables.
6. Join the dating table to the US Counties table. Then select the counties that lost population in the 20-year period from 1990 to 2010. How many are there? In what area of the country are these counties predominantly located? Make a map showing the “losing” counties. Capture the map. (Hint: Create a new layer from the selected features.) 7. Use Summarize to determine the number of counties in each state that lost population. Which three states had the most losing counties, and how many losing counties did each