Pearson Correlation Coefficient and Statistical Significance Quiz

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What does the Pearson Correlation Coefficient (r) measure?

The strength of a linear association between two variables (correct)

The difference in means between two groups

The proportion mean of a continuous variable

The statistical significance of an association

What does an r value of -1 or 1 indicate about the association between two variables?

Statistically insignificant association

Perfect linear association (correct)

Weak association

No association

In the context of measuring association, what does 'null value' refer to?

Perfect association between the variables

Zero association between the variables (correct)

Uncertain association between the variables

Weak association between the variables

Which statistical test is appropriate for comparing the means of two groups with continuous outcomes?

Two-sample t-test Signup and view all the answers

Which statistical test can be used when both the exposure and outcome are binary?

All of the above Signup and view all the answers

What does a chi-square test indicate about the difference between groups?

It is not capable of indicating differences between groups Signup and view all the answers

When would you likely use a chi-square test instead of a two-sample z-test or Odds Ratio/Risk Ratio?

When the causal relationship between exposure and outcome is uncertain Signup and view all the answers

What do scatter plots show patterns in?

Associations between variables Signup and view all the answers

What does the ANOVA test assess?

Difference in means among more than two groups Signup and view all the answers

In the context of chi-square testing, what does the null hypothesis state?

The variables are independent Signup and view all the answers

What does the F-statistic in ANOVA represent?

Difference in means among groups Signup and view all the answers

When using a chi-square test, what does it mean if the p-value is less than the significance level?

The variables are dependent Signup and view all the answers

In ANOVA, what does the alternative hypothesis (HA) claim?

At least one of the means is different Signup and view all the answers

What does a chi-square test assess?

Difference in proportions among more than two groups Signup and view all the answers

What does ANOVA stand for in the context of biostatistics?

Analysis of Variance Signup and view all the answers

In ANOVA, what does HA represent?

The alternative hypothesis Signup and view all the answers

What is the purpose of a Chi-Square test in biostatistics?

To evaluate the association between two categorical variables Signup and view all the answers

What does Ho represent in the context of a Chi-Square test?

The null hypothesis Signup and view all the answers

Which statistical test generates an F-statistic?

ANOVA test Signup and view all the answers

In which type of exposure and outcome does ANOVA test for a significant difference in means?

Categorical exposure (more than 2 levels) and continuous outcome Signup and view all the answers