Project 57
Project description

Test the hypothesis that the mean annual rainfalls in Portland, Oregon; Seattle, Wasghinton; and Tacoma, Washington are all equal. (For this, you may find it helpful to reassemble the data set in a slightly different format.)

Background on the data set

This data set gives annual precipitation totals for Portland (OR), Tacoma (WA), and Seattle (WA) for the years 1966-2006, precipitation being defined as: "Any form of water particles-liquid or solid-that falls from the atmosphere and reaches the ground."

Data Source: Western Regional Climate Center (www.wrcc.dri.edu), specifically "Monthly Totals" under "Monthly Precipitation Listings" for the following: Portland, Tacoma, and Seattle. The definition of precipitation quoted above is also from this website, specifically in their climate and weather terms glossary. (All links accessed June 14, 2008.)

Variables in the data set
The variables in the data set are as follows:
NameUnitsDescription
year(years)year of precipitation measurement
cityPortland, Seattle, or Tacomalocation of measurement
precipitationinchesamount of annual precipiation
Link to the data set
The full data set in csv format is at:
http://hoard.projectivespace.com/datasets/pnwPrecipitation.csv