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Interactive Z & T Tools: Z & T Tables

library(gt)

make_z_table <- function(
  z_min = 0.0,
  z_max = 3.9,
  row_step = 0.1,
  col_step = 0.01
) {

  rows <- seq(z_min, z_max, by = row_step)
  cols <- seq(0.00, 0.09, by = col_step)

  Z <- outer(rows, cols, `+`)
  P <- pnorm(Z)

  df <- as.data.frame(round(P, 4))
  names(df) <- sprintf("%.2f", cols)
  df <- cbind(z = sprintf("%.1f", rows), df)

  df
}

z_tbl <- make_z_table(z_min = 0, z_max = 2.0)

gt(z_tbl) |>
  tab_header(
    title = md("**Standard Normal Table: P(Z ≤ z)**"),
    subtitle = "Rows give z to one decimal; columns add the hundredths place"
  ) |>
  fmt_number(columns = -z, decimals = 4) |>
  cols_label(z = "z") |>
  tab_style(
    style = cell_text(weight = "bold"),
    locations = cells_column_labels(everything())
  )