How Science Works Flashcards by Dhanya Stephen | Brainscape

Q

Advantage of presenting the results as a RATIO?

A

Allows VALID comparison

* Number/Sample size may VARY

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Q

Why use % cover rather than frequency to record the abundance?

A

Difficult
Too many to count
Individual organisms NOT identifiable

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Q

Define “Running Mean”

A

calculating a mean after each sample – can determine the required number of samples
when the running mean is constant the sample
size is sufficient

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Q

Explain why a statistical test is used: (3 marks)

A

A statistical test determines the probability of results being due to chance
Enables null hypothesis to be accepted/rejected
Determines whether results are significant

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