How Far Away Is a Lightning Bolt If It Takes

question 39

Multiple Choice

How far away is a lightning bolt if it takes 20 s for the sound of the associated thunder to reach the observer?

• A) 1 mile
• B) 4 miles
• C) 3 miles
• D) 15 miles

---

Definitions:

Standard Error

The typical deviation found in the distribution of sample statistics, often referring to the mean.

T-statistic

A type of statistic used in hypothesis testing, determined by the difference between the sample mean and the population mean divided by the standard error.

Degrees Of Freedom

The number of values in a final calculation of a statistic that are free to vary.

Null Hypothesis

A statement or hypothesis in statistics that suggests no significant difference or effect; it is the hypothesis that researchers aim to test against.