To Estimate with 95% Confidence the Average Number of Kilometres

question 98

Multiple Choice

To estimate with 95% confidence the average number of kilometres that students living off-campus commute to classes every day, a random sample of 20 students was taken and produced a mean equal to 5.2 km and a standard deviation of 3.05 km. In this case, what would be the approximate value of the upper limit for a 95% confidence interval estimate for the true population mean?

• A) 6.63
• B) 5.20
• C) 3.22
• D) 2.15

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Definitions:

Naturally Occurring

Refers to substances, phenomena, or structures that exist in nature without human intervention.

Predominant Form

The most abundant or stable form of a molecule or ion under specific conditions.

Aqueous Solution

A solution in which the solvent is water, commonly used in chemical reactions and processes.

pI

The isoelectric point of a molecule, the pH at which the molecule carries no net electric charge.