Planaria Chi-Square Lab KEY1

Planarian

Members of the phylum Platyhelminthes, commonly known as flatworms.

Kinesis

A non-directed movement in response to environmental factors such as light, temperature, moisture, or chemicals.

Taxis

Directed movements of organisms toward or away from a stimulus.

Positive Taxis

Movement toward a stimulus.

Negative Taxis

Movement away from a stimulus.

Phototaxis

Response to light.

Chemotaxis

Response to chemicals.

Null Hypothesis (Ho)

A statement that there is no effect or no difference, used as a basis for statistical testing.

Chi-squared test

A statistical test used to compare observed and expected data to analyze categorical variables.

Degrees of Freedom (DF)

A parameter used in statistical tests, calculated as (r-1)(c-1), where r is the number of rows and c is the number of columns.

P value

The probability that the observed data occurred by chance.

Observed Values

The actual data collected during an experiment.

Expected Values

The theoretical values predicted by the null hypothesis.