Calculates the confidence interval for the mean with unknown standard deviation, using the t-statistic (t distribution).
ci_t(x, s, n, conf.level = 0.95, digits = 2)
| x | Sample mean |
|---|---|
| s | Sample standard deviation |
| n | Sample size |
| conf.level | Confidence level to use for the confidence interval (Default is 0.95) |
| digits | Number of digits to round to (Default is 2) |
A tibble with the mean, degrees of freedom, and lower and upper ends of the confidence interval
It can work for dependent (paired) samples using the mean and standard deviation of differences
x <- 80 s <- 15 n <- 20 ci_t(x, s, n)#> # A tibble: 1 × 4 #> mean df lower upper #> <dbl> <dbl> <dbl> <dbl> #> 1 80 19 73.0 87.0