`R/BSDA-package.R`

`Dopamine.Rd`

Data for Exercises 5.14 and 7.49

`Dopamine`

A data frame/tibble with 25 observations on two variables

- dbh
dopamine b-hydroxylase activity (units are nmol/(ml)(h)/(mg) of protein)

- group
a factor with levels

`nonpsychotic`

and`psychotic`

D.E. Sternberg, D.P. Van Kammen, and W.E. Bunney, "Schizophrenia: Dopamine
b-Hydroxylase Activity and Treatment Respsonse," *Science, 216* (1982), 1423 - 1425.

Kitchens, L. J. (2003) *Basic Statistics and Data Analysis*.
Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.

```
boxplot(dbh ~ group, data = Dopamine, col = "orange")
t.test(dbh ~ group, data = Dopamine, var.equal = TRUE)
#>
#> Two Sample t-test
#>
#> data: dbh by group
#> t = -3.9364, df = 23, p-value = 0.0006587
#> alternative hypothesis: true difference in means is not equal to 0
#> 95 percent confidence interval:
#> -119.49885 -37.16782
#> sample estimates:
#> mean in group nonpsychotic mean in group psychotic
#> 164.2667 242.6000
#>
```