Tests for two groups
Besides looking at associations between two or more continuous numeric variables, it is also useful to look for associations between a continuous numeric variable and a group variable, such as between abalone length and the dichotomous adult variable in abaloneKeep.
To look at this relationship, in this exercise, you will perform a t-test to determine if there a difference in abalone lengths between infants and adults.
The abaloneKeep dataset, dplyr and ggplot2 packages have been loaded for you.
This exercise is part of the course
R For SAS Users
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Get n, mean, sd for length by adult groups
abaloneKeep %>%
___ %>%
___ %>%
summarise(across(everything(), list(___ = ~ mean(.x),
___ = ~ sd(.x))),
N = ___)