Sample of two types of electric bulbs were tested for length of life and the following data were obtained.
Sample Size Mean S.D
1 100 61 hours 4 hours
2 200 63 hours 46 hours
Is the difference in the means sufficient to warrant that type I bulbs and superior to type II bulbs?
Mathbot Says...
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.