Two brands of car batteries, both carrying 6-year warranties, were sampled and tested under controlled conditions....

   

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Two brands of car batteries, both carrying 6-year warranties, were sampled and tested under controlled conditions. Five of each brand failed after the number of months shown. Calculate a) both sample means and b) both sample standard deviations. Decide c) which brand battery lasts longer and d) which brand has the more consistent lifetime. Brand A: 67, 63, 63, 76, 69 Brand B: 64, 60, 63, 61, 70 a) What are the sample means? XA b) What are the sample standard deviations? SA = $B= (Round to the nearest hundredth as needed.) XB = c) Which brand battery apparently lasts longer? O Brand B O Brand A Two brands of car batteries, both carrying 6-year warranties, were sampled and tested under controlled conditions. Five of each brand failed after the number of months shown. Calculate a) both sample means and b) both sample standard deviations. Decide c) which brand battery lasts longer and d) which brand has the more consistent lifetime. Brand A: 67, 63, 63, 76, 69 Brand B: 64, 60, 63, 61, 70 a) What are the sample means? XA b) What are the sample standard deviations? SA = $B= (Round to the nearest hundredth as needed.) XB = c) Which brand battery apparently lasts longer? O Brand B O Brand A