Data for Exercises 5.14 and 7.49

Dopamine

Format

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

Source

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

References

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

Examples


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 
#>