What Is the Hardness of Quartz on the Mohs Scale

question 74

Multiple Choice

What is the hardness of quartz on the Mohs scale?

• A) 1
• B) 4
• C) 7
• D) 10

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Definitions:

Normal Distribution

A symmetric, bell-shaped distribution of data in which most of the observations cluster around the central peak and the probabilities for values further away from the mean taper off equally in both directions.

Confidence Interval

A statistical range, with a certain level of confidence, that is likely to contain the true value of an unknown parameter.

Standard Error

The standard deviation of the sampling distribution of a statistic, often used to measure the precision of a sample mean.

Margin of Error

A statistic expressing the amount of random sampling error in a survey's results, indicating a range within which the true population parameter is likely to lie.