Module 11 Practice Questions

Front

What is a two-sample t-Test?

Back

A statistical method used to determine if there is a significant difference between the means of two independent groups.

Front

What does it mean for samples to be independent?

Back

Independent samples are those where the selection of one sample does not influence the selection of the other.

Front

What is the significance of sample size in hypothesis testing?

Back

Larger sample sizes (typically n > 30) provide more reliable estimates of population parameters and increase the power of the test.

Front

What are null and alternative hypotheses?

Back

The null hypothesis (H0) states there is no effect or difference, while the alternative hypothesis (Ha) states there is an effect or difference.

Front

What does a p-value indicate in hypothesis testing?

Back

A p-value measures the strength of evidence against the null hypothesis; a low p-value suggests that the null hypothesis may be rejected.

Front

What is the meaning of H0: μ1 = μ2 = μ3?

Back

This null hypothesis states that the means of three groups are equal.

Front

What does Ha: μ1 ≠ μ2 ≠ μ3 imply?

Back

This alternative hypothesis suggests that at least one group mean is different from the others.

Front

What is a matched pairs situation in statistics?

Back

A matched pairs situation occurs when two measurements are taken on the same subjects, allowing for direct comparison.

Front

What does μd represent in hypothesis testing?

Back

μd represents the mean of the differences in a matched pairs test.

Front

What is the purpose of the National Health and Nutrition Examination Survey (NHANES)?

Back

NHANES is designed to assess the health and nutritional status of adults and children in the United States.