Module 11 Practice Questions (3)

Front

What is a paired t-test?

Back

A statistical method used to compare the means of two related groups to determine if there is a statistically significant difference between them.

Front

When should a paired t-test be used?

Back

It should be used when comparing two related samples, such as measurements taken from the same subjects before and after a treatment.

Front

What is a hypothesis test for matched pairs?

Back

A statistical test used to compare two related samples to determine if their means differ significantly.

Front

What is the null hypothesis (H0) in hypothesis testing?

Back

The null hypothesis states that there is no effect or no difference, and it is the hypothesis that researchers aim to test against.

Front

What does it mean to reject the null hypothesis?

Back

Rejecting the null hypothesis indicates that there is sufficient evidence to support the alternative hypothesis, suggesting a significant effect or difference.

Front

What is ANOVA (Analysis of Variance)?

Back

A statistical method used to compare the means of three or more groups to see if at least one group mean is different from the others.

Front

What does an F-value represent in ANOVA?

Back

The F-value is a ratio of variance estimates that indicates the degree of variation between group means relative to the variation within the groups.

Front

What does a p-value indicate in hypothesis testing?

Back

The 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 significance level (alpha)?

Back

The significance level is a threshold set by the researcher (commonly 0.05) to determine whether to reject the null hypothesis.

Front

What does it mean if the p-value is less than the significance level?

Back

It means there is strong evidence against the null hypothesis, leading to its rejection.