r:general_statistics
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r:general_statistics [2019/10/11 07:46] – [Forming a Confidence Interval for a Mean] hkimscil | r:general_statistics [2019/10/11 07:56] (current) – [Forming a Confidence Interval for a Mean] hkimscil | ||
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Line 512: | Line 512: | ||
> SE | > SE | ||
[1] 2.458358 | [1] 2.458358 | ||
- | > E <- qt(.975, df=n-1)*SE | + | ## qt fun: qt(prob, df) zscore 2점에 해당하는 점수는? |
+ | > qtv <- qt(.975, df=n-1) | ||
+ | > qtv | ||
+ | [1] | ||
+ | ## qtv는 2에 해당하는 95퍼센트 CL | ||
+ | ## 이 때의 CI는 | ||
+ | > E <- qtv*SE | ||
> E | > E | ||
[1] 4.940254 | [1] 4.940254 | ||
Line 520: | Line 526: | ||
</ | </ | ||
- | < | + | < |
+ | > t.test(x, mu=98) | ||
One Sample t-test | One Sample t-test | ||
data: x | data: x | ||
- | t = 39.052, df = 49, p-value | + | t = 0.37089, df = 49, p-value |
- | alternative hypothesis: true mean is not equal to 0 | + | alternative hypothesis: true mean is not equal to 98 |
95 percent confidence interval: | 95 percent confidence interval: | ||
- | | + | |
sample estimates: | sample estimates: | ||
mean of x | mean of x | ||
- | 96.00386 | + | 98.83223 |
+ | |||
+ | > t.test(x, mu=100) | ||
+ | |||
+ | One Sample t-test | ||
+ | |||
+ | data: x | ||
+ | t = -0.52043, df = 49, p-value = 0.6051 | ||
+ | alternative hypothesis: true mean is not equal to 100 | ||
+ | 95 percent confidence interval: | ||
+ | 94.32303 103.34143 | ||
+ | sample estimates: | ||
+ | mean of x | ||
+ | | ||
+ | |||
+ | > t.test(x, mu=95) | ||
+ | |||
+ | One Sample t-test | ||
+ | |||
+ | data: x | ||
+ | t = 1.7079, df = 49, p-value = 0.09399 | ||
+ | alternative hypothesis: true mean is not equal to 95 | ||
+ | 95 percent confidence interval: | ||
+ | 94.32303 103.34143 | ||
+ | sample estimates: | ||
+ | mean of x | ||
+ | | ||
+ | |||
+ | > | ||
</ | </ |
r/general_statistics.txt · Last modified: 2019/10/11 07:56 by hkimscil