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Please work out these question and show me how you got the answer

The following data were obtained from a between-subjects manipulation:

Determine if there is a significant difference between the treatments. Explain your conclusion.

A researcher obtains the following sample from a population with mean = 8 and an unknown standard deviation:

Sample scores = 5, 0, 4, 7, 3, 7, 8, 2, 9

Is there evidence to suggest that this sample is significantly different from the population? Explain.

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