The Mean Weight of Trucks Traveling on a Particular Section

question 55

Multiple Choice

The mean weight of trucks traveling on a particular section of Highway 401 is not known. A
Provincial highway inspector needs an estimate of the mean. He selects a random sample of 49
Trucks passing the weighing station and finds the mean is 15.8 tons, with a standard deviation of the
Sample of 3.8 tons. What is the 95 percent interval for the population mean?

• A) 14.7 and 16.9
• B) 13.2 and 17.6
• C) 10.0 and 20.0
• D) 16.1 and 18.1

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Definitions:

Rational Subgroups

Groupings within a data set that are formed based on logical or natural relationships, often used in quality control to evaluate variation within and between these groups.

Item-To-Item Variation

The variability in characteristics or attributes between individual items within a batch or sample.

Special Causes

Variations in a process that are caused by specific, identifiable factors, distinguishing them from random, common causes of variation.

Elements of Unsaturation

Calculations used to determine the degree of unsaturation within a molecule, indicating the presence of rings, double bonds, or triple bonds.