```r
t.test(Lshell)
```

```
## 
## 	One Sample t-test
## 
## data:  Lshell
## t = 76.508, df = 112, p-value < 2.2e-16
## alternative hypothesis: true mean is not equal to 0
## 95 percent confidence interval:
##  104.0682 109.6017
## sample estimates:
## mean of x 
##   106.835
```