1. A study was conducted on the life of Duracell batteries and on the life of Energizer batteries. The study found that a sample of 10 Duracell batteries had a mean life in hours of 26.2 with a standard deviation of 4.1 and a range of 24. The results for a sample of 10 Energizer batteries were as follows (in hours):

Question

1.	A study was conducted on the life of Duracell batteries and on the life of Energizer batteries.  The study found that a sample of 10 Duracell batteries had a mean life in hours of 26.2 with a standard deviation of 4.1 and a range of 24.  The results for a sample of 10 Energizer batteries were as follows (in hours):

15	18	19	23	25	25	28	30	34	38

Which batteries have a more uniform life in hours?  Why? (Your explanation should contain direct references to chapter 3 concepts.)