a study compared fuel economics for two types of trucks . Twelve Volkswagen trucks used in the study gave an average of 16 km per litre with a standard deviation of 0.1km per litre, while 10 toyota trucks gave am average of 11km per litre with a standard deviation of 0.8km per litre,?
assuming that the distance per litre for each truck mode are approximately normally distributed.
A) construct a 90% confidence interval for the difference between the average kilometers per litre of these two trucks assuming the population variance are equal.
b) construct a 90% confidence interval for a1/ a1??? where a1 and a2 are respectively the standard deviation for the distances obtained per litre of fuel by the Volkswagen and Toyota trucks ,
c)? were we justified in assuming that the population variance are equal in oart (a)? why?
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Oct 07, 2020EXPERT
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