Module 12 Practice Questions (3)

Front

What is the expected count in a Chi-Square test?

Back

The expected count is the frequency that would be expected in each category if the null hypothesis were true, calculated based on the total sample size and the proportions of the categories.

Front

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

Back

The null hypothesis (H0) is a statement that there is no effect or no difference, and it serves as the default assumption that any observed differences are due to sampling variability.

Front

What is the alternative hypothesis (Ha)?

Back

The alternative hypothesis (Ha) is a statement that indicates the presence of an effect or a difference, opposing the null hypothesis.

Front

How do you calculate the contribution to the Chi-Square test statistic?

Back

The contribution is calculated using the formula: (Observed Count - Expected Count)² / Expected Count.

Front

What does a p-value represent in hypothesis testing?

Back

A p-value indicates the probability of obtaining the observed results, or more extreme results, assuming that the null hypothesis is true.

Front

What does it mean if the p-value is less than the significance level (e.g., 0.05)?

Back

It suggests that there is sufficient evidence to reject the null hypothesis in favor of the alternative hypothesis.

Front

What is a two-way table?

Back

A two-way table is a statistical table that displays the frequency distribution of variables, allowing for the analysis of the relationship between two categorical variables.

Front

What is the significance level in hypothesis testing?

Back

The significance level (alpha) is the threshold for determining whether to reject the null hypothesis, commonly set at 0.05.

Front

What is the relationship between gender and ear piercing in statistical studies?

Back

Statistical studies may explore whether there is a significant association between gender and the likelihood of having ear piercings, often using Chi-Square tests.

Front

What is the Chi-Square test used for?

Back

The Chi-Square test is used to determine if there is a significant association between categorical variables.