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Testing Equality of the Means of Two Populations

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Find a dataset: approximately 30-100 scores or observations. Write a null and alternative hypothesis, conduct a statistical significance test (in SPSS or Excel), and tell what decision you'd make about the null hypothesis, and why. You'll need to include your SPSS or Excel output.

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This solution contains an example problem of testing the equality of the means of two populations. The detailed procedure and computation are provided.

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The following data provide cell diameters (m) of 50 tumor cells and 40 lymphocytes obtained from biopsies of tissue from patients with melanoma. Applying the five-step hypothesis testing procedures examine whether the average size of tumor cells and lymphocytes differ at 5% level of significance.

Tumor ...

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