Records on a Fleet of Trucks Reveal That the Average

question 13

Essay

Records on a fleet of trucks reveal that the average life of a set of spark plugs is normally distributed with a mean of 22,100 miles. The fleet owner purchased 18 sets and found that the sample average life was 23,400 miles; the sample standard deviation was 1,412 miles. To determine if the spark plugs average 22,100 miles, what is the critical value for the test using a 0.05 level of significance?

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Definitions:

Aniline

An organic compound with the formula C6H5NH2, a primary amine derived from benzene, used in the manufacture of dyes, drugs, and plastics.

p-Nitroaniline

An organic compound derived from aniline, characterized by a nitro group positioned para (opposite) to the amine group, primarily used in the synthesis of dyes, pharmaceuticals, and agricultural chemicals.

p-Toluidine

An organic compound, a derivative of aniline, where a methyl group is para (i.e., in the 4-position) to the amino group on the benzene ring.

Enantiomers

Molecules that are mirror images of each other but cannot be superimposed, often displaying different behaviors in chiral environments.