R語言｜函數｜t.test()

函數介紹

t.test(x, y = NULL,

       alternative = c("two.sided", "less", "greater"),

       mu = 0, paired = FALSE, var.equal = FALSE,

       conf.level = 0.95, ...)

Value

A list with class "htest" containing the following components:

statistic	the value of the t-statistic.
parameter	the degrees of freedom for the t-statistic.
p.value	the p-value for the test.
conf.int	a confidence interval for the mean appropriate to the specified alternative hypothesis.
estimate	the estimated mean or difference in means depending on whether it was a one-sample test or a two-sample test.
null.value	the specified hypothesized value of the mean or mean difference depending on whether it was a one-sample test or a two-sample test.
alternative	a character string describing the alternative hypothesis.
method	a character string indicating what type of t-test was performed.
data.name	a character string giving the name(s) of the data.

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例題：比較甲、乙兩種安眠藥地療效，將20名患者分成兩組，每組10人，分別服用甲、乙兩種安眠藥，獲得相關數據表所列。一直服用兩種安眠藥後增加地睡眠時間服從方差相同地正態分佈，且兩組實驗相互獨立。顯著性水平＝0.05，試問兩種安眠藥地療效有無顯著差異？

表1 相關數據

類別	延長睡眠時間／小時
服用甲種藥	1.9	0.8	1.1	0.1	0.1	4.4	5.5	1.6	4.6	3.4
服用乙種藥	0.7	－1.6	－0.2	－1.2	－0.1	3.4	3.7	0.8	0.0	2.0

分析：相同時，假設檢驗爲；

#函數t.test()；
x<-c(1.9,0.8,1.1,0.1,0.1,4.4,5.5,1.6,4.6,3.4)
y<-c(0.7,-1.6,-0.2,-1.2,-0.1,3.4,3.7,0.8,0.0,2.0)
t.test(x,y)