[1] Carbon monoxide readings:
[1] 58 63 48 52 68

        One Sample t-test

data:  x 
t = 2.16, df = 4, p-value = 0.09689
alternative hypothesis: true mean is not equal to 50 
95 percent confidence interval:
 47.774 67.826 
sample estimates:
mean of x 
     57.8