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In order to test if there is a difference between means from two populations, which of the following assumptions are not required?

a. The dependent variable scores must be a continuous quantitative variable.

b. The scores in the populations are normally distributed.

c. Each value is sampled independently from each other value.

d. The two populations have similar means

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For testing for the difference between two population means, the following assumptions must hold:

The dependent target variable must be scaled on a ratio or interval scale.
The population distribution of both populations must be normal.
The samples must be drawn in a random fashion; that is, each set of observations are independent.

Apart from the above, the condition for equal variances and dependent samples is applicable for further categorizing tests.

Hence, option d. is the correct answer.

In a test comparing two mean values for two different populations, the two populations need not have similar means.

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