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According to the type of samples that were taken from the experiment, it is inferred that the 60 selected samples represent a random sample because they were randomly selected.
A sample is a term that refers to a subset of data selected from a total of data obtained in an investigation.
According to the above, if the researchers take a sample of 60 recordings of the heart rate of the diving birds, it can be considered a valid sample because it is random and will allow conclusions to be drawn regarding the experiment.
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