Water pH levels of 75 water samples taken in the Great Smoky Mountains
Data for Exercises 6.40, 6.59, 7.10, and 7.35
Smokyph
A data frame/tibble with 75 observations on three variables
water sample pH level
charater variable with values low (elevation below 0.6 miles),
and high (elevation above 0.6 miles)
elevation in miles
Schmoyer, R. L. (1994), Permutation Tests for Correlation in Regression Errors, Journal of the American Statistical Association, 89, 1507-1516.
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
summary(Smokyph$waterph)
tapply(Smokyph$waterph, Smokyph$code, mean)
stripchart(waterph ~ code, data = Smokyph, method = "stack",
pch = 19, col = c("red", "blue"))
t.test(Smokyph$waterph, mu = 7)
SIGN.test(Smokyph$waterph, md = 7)
t.test(waterph ~ code, data = Smokyph, alternative = "less")
t.test(waterph ~ code, data = Smokyph, conf.level = 0.90)
## Not run:
library(ggplot2)
ggplot2::ggplot(data = Smokyph, aes(x = waterph, fill = code)) +
geom_dotplot() +
facet_grid(code ~ .) +
guides(fill = FALSE)
## End(Not run)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.