What is the primary purpose of correlation analysis?

• To find the median of a dataset

• To test the linear relationship between variables

• To determine the cause of changes in variables

• To calculate the mean of a dataset

Why do we use a sample to test correlation significance?

• Because it is impossible to survey the entire population

• Because samples are always more accurate

• Because samples are easier to manipulate

• Because samples provide more data

Which test is used to determine the significance of a correlation coefficient?

• Chi-square test

• Z-test

• F-test

• T-test

What does the null hypothesis state in correlation significance testing?

• There is a linear relationship

• The correlation coefficient is negative

• There is no linear relationship

• The correlation coefficient is positive

How is the t-value calculated in correlation significance testing?

• Using the variance and range

• Using the mean and standard deviation

• Using the correlation coefficient and sample size

• Using the median and mode

What does a p-value smaller than the significance level indicate?

• The data is insufficient

• The null hypothesis is rejected

• There is no correlation

• The null hypothesis is retained

What happens if the p-value is greater than the significance level?

• The null hypothesis is rejected

• There is a significant correlation

• The null hypothesis is retained

• The data is invalid

Which online tool is recommended for checking correlation significance?

• correlate.com

• analyzetool.org

• statcalc.com

• datadep.net

In the example provided, what was the correlation between age and salary?

• 0.679

• 0.015

• 0.500

• 0.800

What was the p-value in the example correlation between age and salary?

• 0.679

• 0.015

• 0.800

• 0.500