zinc {statsr}

Zinc Concentration in Water

Description

Trace metals in drinking water affect the flavor and an unusually high concentration can pose a health hazard. Ten pairs of data were taken measuring zinc concentration in bottom water and surface water.

Usage

zinc

Format

A data frame with 10 observations on the following 4 variables.

location

sample number

bottom

zinc concentration in bottom water

surface

zinc concentration in surface water

difference

difference between zinc concentration at the bottom and surface

Source

PennState Eberly College of Science Online Courses

Examples

 data(zinc)
 str(zinc)
 plot(bottom ~ surface, data=zinc)
 # use paired t-test to test if difference in means is zero