16 Questions
What happens if you run a correlation analysis on non-linear data
The result will be invalid
What result do you see when variables are completely independent of each other.
A zero correlation coefficient
Which of the following is FALSE
A correlation of .3007 is a medium
We are measuring a correlation between water and H2O molecules, which we expect to have a high correlation. Which of the following is TRUE?
A correlation of .7 is low
For each of the following, indicate whether you would expect a positive or a nega- tive correlation. a. Model year and price for a used Honda b. IQ and grade point average for high school students c. Daily high temperature and daily energy consumption for 30 winter days in New York City
a. positive, b. positive, c. negative
he data points would be clustered more closely around a straight line for a corre- lation of -0.80 than for a correlation of +0.05. (True or false?)
True
If the data points are clustered close to a line that slopes up from left to right, then a good estimate of the correlation would be +0.90. (True or false?)
True
If a scatter plot shows a set of data points that form a circular pattern, the correla- tion should be near zero. (True or false?)
True
Describe what is measured by a Pearson correlation.
The Pearson correlation measures the degree and direction of the linear relationship between two variables. ·
Can SP ever have a value less than zero?
True
Which of the following statements best describes the concept of "regression toward the mean" in statistical analysis?
It refers to the tendency of data points to move toward the mean or average value over time.
In null hypothesis testing, the null hypothesis (H0) typically represents:
The default or status quo hypothesis that there is no effect or relationship.
In the context of correlation analysis, why is it especially important for the correlation value to be relatively high when dealing with low sample sizes?
Low sample sizes are more likely to produce unreliable correlation estimates.
Which of the following is FALSE.
A Cronbach Alpha score of 0 means the variables have a reliable relationship.
Increasing the number of items on a scale _____ the Cronbach's Alpha.
Increases
Which of the following is correct?
A Cronbach Alpha level .66 is questionable
Test your knowledge on correlation analysis and non-linear data with this quiz. Answer questions about the results of correlation analysis on non-linear data, the impact of independent variables on correlation, and expectations for positive or negative correlation in different scenarios.
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