Size of family versus cost per person per week for groceries

Data for Exercise 2.89

Family

Format

A data frame/tibble with 20 observations on two variables

number

number in family

cost

cost per person (in dollars)

References

Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.

Examples

plot(cost ~ number, data = Family)
abline(lm(cost ~ number, data = Family), col = "red")

cor(Family$cost, Family$number)
#> [1] -0.8680791

if (FALSE) {
library(ggplot2)
ggplot2::ggplot(data = Family, aes(x = number, y = cost)) + 
           geom_point() + 
           geom_smooth(method = "lm") + 
           theme_bw()
}