Average amount of unburned hydrocarbons

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Reference no: EM131015202

In order to determine the average amount of unburned hydrocarbons pro­ duced by a particular brand  of carburetor  (adjusted  in what  is believed to be the optimal way), a random sample of 35 carburetors  was  taken, and the amount of unburned hydrocarbons recorded. The three largest and three smallest values were 1.7, 2, 4.1 and 7.9, 8.2, 9.3. The average amount was computed to be 5.7 with a sample standard deviation of 0.9. The manufac­ turer suspects that the distribution of unburned hydrocarbons is not nor­ mal.

(a) Construct an 88% confidence interval for the average amount of unburned hydrocarbons for the entire population of this brand of car­ buretor.

(b) Construct an 88% prediction interval for the amount of unburned hydrocarbons produced by the next carburetor tested.

(c) Construct an interval that with 90% confidence will cover 90% of the population.

Reference no: EM131015202

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