Average Annual Temperature in Fresno, CA

First

Decade

20th Average

Last

Decade

20th Average

First

Decade

21st Average

Second

Decade

21st Average

Century Temp (F) Century Temp (F) Century Temp (F) Century Temp (F)

1900 62.3 1990 63.2 2000 64.2 2010 64.1

1901 63.0 1991 63.8 2001 65.1 2011 64.0

1902 61.8 1992 65.1 2002 64.5 2012 67.0

1903 61.8 1993 63.7 2003 65.4 2013 67.0

1904 63.2 1994 63.3 2004 64.7

1905 62.5 1995 64.5 2005 65.1

1906 62.7 1996 65.2 2006 64.5

1907 61.2 1997 64.8 2007 64.6

1908 61.3 1998 62.3 2008 65.1

1909 61.2 1999 63.3 2009 65.0

Source: Weather Underground (www.wunderground.com)

1. Compute the mean, median, mode, range, and standard deviation for each of the three

full decades of data for Fresno, CA provided in the table above. Be sure to show the

steps you took to calculate each.

2. Compute the mean and standard deviation for the years 2010 through 2013. Again,

show the steps you took to calculate each.

3. Based on your analysis of the descriptive statistics you prepared, answer the following:

a. Do you believe there is evidence to suggest that there has been a gradual warming

trend over the last 100 years? Please be sure to explain your answer with details

from your descriptive statistics.

b. Compare the 100-year warming trend over the first and last decades of the twentieth

century to the 20-year trend from the last decade of the twentieth century (1990-

1999) to the following decade (2000-2009).

Is there evidence that the warming trend is speeding up? Again, please be sure to

explain your answer with details from the data.