A random sample of 25 batteries has a mean lifetime of 42.3 hours with sample standard deviation 5.1 hours. The lifetimes are approximately normally distributed.
What is the standard error of the mean for this sample?
- A
0.20
- B
5.10
- Ccheck_circle
1.02
- D
0.41
Explanation
SE = s/sqrt(n) = 5.1/sqrt(25) = 5.1/5 = 1.02.