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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Contributors

Feedback

Hypothesis Testing Comparing Means of two populations: variances unknown but assumed unequal

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When variances across two independent groups are unequal, which of the following test is an appropriate test to test population means?

a: Games-Howell post hoc test Explanation

Explanation

b: F-test Explanation

Explanation

c: Welch's t test Explanation

Explanation

d: Kruskal-Wallis test Explanation

Explanation

Test statistic formula under Welch t-test is

t = \frac{m_A - m_B}{\sqrt{\frac{S_A^2}{n_A} + \frac{S_B^2}{n_B}}}

Explanation

t = \frac{m_A + m_B}{\sqrt{\frac{S_A^2}{n_A} + \frac{S_B^2}{n_B}}}

Explanation

t = \frac{m_A - m_B}{\frac{S_A^2}{n_A} + \frac{S_B^2}{n_B}}

Explanation

t = \frac{m_A - m_B}{\frac{S_A^2}{n_A} - \frac{S_B^2}{n_B}}

Explanation

Which of the following assumption is not true regarding Welch t-test?

a: Two samples are dependent Explanation

Explanation

b: No significant outliers in two groups Explanation

Explanation

c: Data for each groups should be normally distributed Explanation

Explanation

d: Two groups are independent Explanation

Explanation

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