Data for Exercise 7.52

Asthmati

Format

A data frame/tibble with nine observations on three variables

drug

asthmatic relief index for patients given a drug

placebo

asthmatic relief index for patients given a placebo

difference

difference between the placebo and drug

References

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

Examples


qqnorm(Asthmati$difference)
qqline(Asthmati$difference)

shapiro.test(Asthmati$difference)
#> 
#> 	Shapiro-Wilk normality test
#> 
#> data:  Asthmati$difference
#> W = 0.95124, p-value = 0.7037
#> 
with(data = Asthmati,
     t.test(placebo, drug, paired = TRUE, mu = 0, alternative = "greater")
)
#> 
#> 	Paired t-test
#> 
#> data:  placebo and drug
#> t = 2.753, df = 8, p-value = 0.01247
#> alternative hypothesis: true difference in means is greater than 0
#> 95 percent confidence interval:
#>  0.6490697       Inf
#> sample estimates:
#> mean of the differences 
#>                       2 
#>