Which One of These Groups Does Not Belong to the Phylum

question 6

Multiple Choice

Which one of these groups does not belong to the phylum Echinodermata?

• A)sea cucumber
• B)sea urchins
• C)lancelets
• D)basket stars
• E)sand dollars

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Definitions:

Experimental Design

A methodological layout of research where variables are manipulated to determine their effect on a dependent variable under controlled conditions.

Hypothesis Testing

A statistical method used to determine the likelihood that a hypothesis about a data set is true, based on sample data.

Difference

The state or measure of not being identical or the same; a distinction that can exist between entities or concepts.

Confounding Variable

An extraneous factor in a study that correlates with both the dependent and independent variables, potentially skewing the results.