What is the name for the group of elements indicated by the shaded portion of the periodic table? 
Definitions:
Sample
A selected subset of individuals or items from a larger population used to estimate characteristics of the whole population.
Sampling Error
The error caused by observing a sample instead of the whole population, leading to potential differences between the sample statistic and population parameter.
Population Mean
The average of all the data points in a population.
Simple Random Samples
A sampling method in which every individual or item from a population has an equal chance of being selected.
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