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From [link] , find the number of towns that have rainfall between 2.95 and 9.01 inches.
6 + 7 + 15 = 28 towns
In your class, have someone conduct a survey of the number of siblings (brothers and sisters) each student has. Create a frequency table. Add to it a relative frequency column and a cumulative relative frequency column. Answer the following questions:
Nineteen people were asked how many miles, to the nearest mile, they commute to work each day. The data are as follows:
DATA | FREQUENCY | RELATIVE
FREQUENCY |
CUMULATIVE
RELATIVE FREQUENCY |
---|---|---|---|
3 | 3 | $\frac{3}{19}$ | 0.1579 |
4 | 1 | $\frac{1}{19}$ | 0.2105 |
5 | 3 | $\frac{3}{19}$ | 0.1579 |
7 | 2 | $\frac{2}{19}$ | 0.2632 |
10 | 3 | $\frac{4}{19}$ | 0.4737 |
12 | 2 | $\frac{2}{19}$ | 0.7895 |
13 | 1 | $\frac{1}{19}$ | 0.8421 |
15 | 1 | $\frac{1}{19}$ | 0.8948 |
18 | 1 | $\frac{1}{19}$ | 0.9474 |
20 | 1 | $\frac{1}{19}$ | 1.0000 |
[link] represents the amount, in inches, of annual rainfall in a sample of towns. What fraction of towns surveyed get between 11.03 and 13.05 inches of rainfall each year?
$\frac{9}{50}$
[link] contains the total number of deaths worldwide as a result of earthquakes for the period from 2000 to 2012.
Year | Total Number of Deaths |
---|---|
2000 | 231 |
2001 | 21,357 |
2002 | 11,685 |
2003 | 33,819 |
2004 | 228,802 |
2005 | 88,003 |
2006 | 6,605 |
2007 | 712 |
2008 | 88,011 |
2009 | 1,790 |
2010 | 320,120 |
2011 | 21,953 |
2012 | 768 |
Total | 823,356 |
Answer the following questions.
[link] contains the total number of fatal motor vehicle traffic crashes in the United States for the period from 1994 to 2011.
Year | Total Number of Crashes | Year | Total Number of Crashes |
---|---|---|---|
1994 | 36,254 | 2004 | 38,444 |
1995 | 37,241 | 2005 | 39,252 |
1996 | 37,494 | 2006 | 38,648 |
1997 | 37,324 | 2007 | 37,435 |
1998 | 37,107 | 2008 | 34,172 |
1999 | 37,140 | 2009 | 30,862 |
2000 | 37,526 | 2010 | 30,296 |
2001 | 37,862 | 2011 | 29,757 |
2002 | 38,491 | Total | 653,782 |
2003 | 38,477 |
Answer the following questions.
“State&County QuickFacts,” U.S. Census Bureau. http://quickfacts.census.gov/qfd/download_data.html (accessed May 1, 2013).
“State&County QuickFacts: Quick, easy access to facts about people, business, and geography,” U.S. Census Bureau. http://quickfacts.census.gov/qfd/index.html (accessed May 1, 2013).
“Table 5: Direct hits by mainland United States Hurricanes (1851-2004),” National Hurricane Center, http://www.nhc.noaa.gov/gifs/table5.gif (accessed May 1, 2013).
“Levels of Measurement,” http://infinity.cos.edu/faculty/woodbury/stats/tutorial/Data_Levels.htm (accessed May 1, 2013).
Courtney Taylor, “Levels of Measurement,” about.com, http://statistics.about.com/od/HelpandTutorials/a/Levels-Of-Measurement.htm (accessed May 1, 2013).
David Lane. “Levels of Measurement,” Connexions, http://cnx.org/content/m10809/latest/ (accessed May 1, 2013).
Some calculations generate numbers that are artificially precise. It is not necessary to report a value to eight decimal places when the measures that generated that value were only accurate to the nearest tenth. Round off your final answer to one more decimal place than was present in the original data. This means that if you have data measured to the nearest tenth of a unit, report the final statistic to the nearest hundredth.
In addition to rounding your answers, you can measure your data using the following four levels of measurement.
When organizing data, it is important to know how many times a value appears. How many statistics students study five hours or more for an exam? What percent of families on our block own two pets? Frequency, relative frequency, and cumulative relative frequency are measures that answer questions like these.
What type of measure scale is being used? Nominal, ordinal, interval or ratio.
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