regression analysis: simplify complex data relationships coursera weekly challenges 4 answers
Test your knowledge: The chi-squared test
1. The chi-squared goodness of fit test determines whether an observed categorical variable follows an expected distribution.
- True
- False
2. Which test determines whether two categorical variables are associated with each other?
- Chi-squared test for dependence
- Chi-squared alternative of fit test
- Chi-squared goodness of fit test
- Chi-squared test for independence
3. Fill in the blank: The chi-squared statistic equals the sum of the observed number minus the expected number, squared, divided by the _____ number.
- observed
- predicted
- expected
- hypothesis
Test your knowledge: Analysis of variance
4. Which of the following statements accurately describe t-tests and analyses of variance? Select all that apply.
- A t-test can only test the difference of mean between two groups.
- A t-test can test means between several groups.
- An analysis of variance test can only test the difference of mean between two groups.
- An analysis of variance test can test means between several groups.
5. Which of the following are analysis of variance (ANOVA) tests? Select all that apply.
- Five-way ANOVA
- One-way ANOVA
- Half-way ANOVA
- Two-way ANOVA
6. Fill in the blank: A post hoc test performs a pairwise comparison between all available groups while controlling for the _____.
- confidence interval
- variable selection
- Tukey’s HSD
- error rate
Test your knowledge: ANCOVA, MANOVA, and MANCOVA
7. Which statistical technique better isolates the relationship between a single categorical variable of interest and the Y variable?
- Analysis of covariance (ANCOVA)
- Multivariate analysis of variance (MANOVA)
- One-way ANOVA
- Multivariate analysis of covariance (MANCOVA)
8. Which of the following statements accurately describe ANCOVA and linear regression? Select all that apply.
- ANCOVA includes covariates to gain a more clear understanding of the categorical variable.
- ANCOVA allows for continuous and categorical independent variables
- Linear regression focuses on a continuous Y variable
- Linear regression helps predict the Y variable for unrecognized data.
Shuffle Q/A 1
9. What is the key difference between MANCOVA and MANOVA?
- MANCOVA includes a null hypothesis.
- MANCOVA controls for covariates.
- MANOVA includes a categorical variable.
- MANOVA has two or more continuous variables.
Weekly challenge 4
10. Fill in the blank: The _____ determines whether an observed categorical variable follows an expected distribution.
- f-test
- bias-variance test
- chi-squared test for independence
- chi-squared goodness of fit test
