Pyrex® Glass Is Formed by Adding an Oxide of ________

question 179

Multiple Choice

Pyrex® glass is formed by adding an oxide of ________ to soda-lime glass.

• A)lead
• B)cobalt
• C)boron
• D)silver
• E)phosphorous

---

Definitions:

Lurking Variable

A variable that affects both variables of interest in a study but was not included in the study, potentially confounding the results.

Outdoor Temperature

The temperature of the air outside, which can vary widely depending on the weather, time of day, and geographic location.

Association

A relationship or link between two or more variables, where changes in one variable correspond to changes in the other.

Life Expectancy

The average period that an individual is expected to live, based on statistical averages.