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the company wanted to tried a new battery phone version. they employers tried them out on...

the company wanted to tried a new battery phone version. they employers tried them out on 3 phones- chosen at random. The 3 phones were randomily selected from a list, in order to be representative.
new battery time per day: 42, 49,35. mean 42, variance 49. old baterry time per day: 34,41,30. mean 35, variance 31.
The 95% confidence interval for the improvement is therefore 7.0 +\-how much? a. 6.1,b. 14.4 c. 10.2 d. 4.3
Math   Statistics-And-Probability   
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