Question

The manager of a gasoline supply corporation wants to estimate the actual amount of gasoline contained in standard 42-gallon barrels purchased from a nationally known manufacturer. The manufacturer’s specifications state that the amount of gasoline is normally distributed with a standard deviation of 0.65 gallon. A random sample of 25 barrels is selected, and the sample mean amount of gasoline per 42-gallon barrel is 42.15 gallons. Construct a 90% confidence interval estimate for the population mean amount of gasoline contained in a standard 42-gallon barrel.

Select one:

a. 42 ± 1.7109 (0.65) / 25

b. 42 ± 1.645 (0.65) / 5

c. 42.15 ± 1.7109 (0.65) / 25

d. 42.15 ± 1.645 (0.65) / 5

Answer 1

thank you.