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There are several methods for producing an APA-style table output in R, but here is a simple method using the apaTables package:

1. Install the apaTables package in R using the command:

install.packages("apaTables")

1. Load the apaTables package using the command:

library(apaTables)

1. Create a data frame with your data:

data <- data.frame(
  Group = c("Group 1", "Group 2", "Group 3"),
  Mean = c(25.5, 18.8, 21.3),
  SD = c(3.2, 4.5, 2.9)
)

1. Use the apa.table() function to create an APA-style table:

apa.table(
  data, 
  caption = "Descriptive statistics for three groups", 
  format = "f", 
  digits = 1, 
  table.number = 1
)

This will create an APA-style table with the data, table caption, formatted numbers, and table number. You can customize the function to display different statistics, columns, and formatting options.