Figure 4.22 -According to Figure 4.22 Which Types of Volcanic Rock Can

question 64

Multiple Choice

Figure 4.22
-According to Figure 4.22 which types of volcanic rock can be found in composite volcanoes?

• A) Basaltic, Andesitic, and Dacitic
• B) Basaltic, Andesitic, Dacitic and Rhyolitic
• C) Basaltic and Andesitic
• D) Andesitic

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Definitions:

Pooled Standard Deviation

Pooled Standard Deviation is a method to estimate the standard deviation from several different samples having different sizes, assuming they come from the same population.

Sample Means

The average value of a set of observations drawn from a population.

Lower Control Limit

The threshold in a control chart below which the process variation is considered to indicate an out-of-control condition.

Correct Mean

The accurate average value of a data set computed by summing all the values and dividing by the count of the values.