Confidence interval for difference of the mean between 2 samples (known sigmas)

Calculates the confidence interval for the difference of the mean between 2 samples (Z distribution).

ci_z2(x1, sig1, n1, x2, sig2, n2, conf.level = 0.95, digits = 2)

Arguments

x1	Sample's 1 mean
sig1	Population's 1 standard deviation
n1	Sample size of sample 1
x2	Sample's 2 mean
sig2	Population's 2 standard deviation
n2	Sample size of sample 2
conf.level	Confidence level to use for the confidence interval (Default is 0.95)
digits	Number of digits to round to (Default is 2)

Value

A tibble with the difference of means, and lower and upper ends of the confidence interval

Examples

x1 <- 42
sig1 <- 8
n1 <- 75
x2 <- 36
sig2 <- 6
n2 <- 50
ci_z2(x1, sig1, n1, x2, sig2, n2)
#> # A tibble: 1 × 3
#>   mean_diff lower upper
#>       <dbl> <dbl> <dbl>
#> 1         6  3.54  8.46