Random Sampling of two Samples?

Question

Sample A has a mean of 194 hours and a standard deviation of 10.67 hours.
Sample B has a mean of 204.0 hours and standard deviation 9.02 hours.

i) Show whether the data provides evidence that sample A are more variable than sample B.
ii) Show whether the data provides evidence that spark plugs sample B last longer on average than those from sample A.

Answer 1

i) Yes, the data provides evidence that sample A is more variable than sample B. This evidence is the greater standard deviation of sample A

ii) Yes, the data provides evidence that on the average, the sample B plugs last longer than the sample A ones. The mean for B is more hours than the mean for A.

Answer 2

I'd say i. yes, and ii. no, because the standard deviation is a measure of variability, and sample b says nothing about spark plugs.

Answer 3

Yes O/K if you say so. BIt deep for this forum is it not.