Truck Tire Life Is Normally Distributed with a Mean of 60,000

question 89

Multiple Choice

Truck tire life is normally distributed with a mean of 60,000 miles and a standard deviation of 4,000 miles. What is the probability that a tire will last 72,000 miles or more?

• A) 0.0013
• B) 0.9987
• C) 0.4987
• D) 0.9544

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Definitions:

Type II Error

An error resulting from failing to reject an incorrect null hypothesis.

Sample Size

The number of observations or elements chosen from a population for the purpose of statistical analysis.

Significance Level

A threshold within which the p-value of a hypothesis test must fall for the result to be deemed statistically significant, typically set at 0.05 or 5%.

Test Power

The likelihood that a statistical test will correctly reject a false null hypothesis, identifying an effect when it is present.