Podcast
Questions and Answers
What happens if you run a correlation analysis on non-linear data
What happens if you run a correlation analysis on non-linear data
- It does not matter if the data is linear or non-linear, you will achieve the same result.
- The result can be interpreted as a non-linear correlation coefficient.
- The result will be invalid (correct)
- People don't worry about linearity, the mechanisms of the inferential statistics looks after the fact the data is linear or non-linear.
What result do you see when variables are completely independent of each other.
What result do you see when variables are completely independent of each other.
- A zero correlation coefficient (correct)
- You will see a positive or negative correlation
- The result will be invalid
- The result will be -1
Which of the following is FALSE
Which of the following is FALSE
- A correlation of .198 is a small
- A correlation of .87 is a large
- A correlation of .05 is a small
- A correlation of .3007 is a medium (correct)
We are measuring a correlation between water and H2O molecules, which we expect to have a high correlation. Which of the following is TRUE?
We are measuring a correlation between water and H2O molecules, which we expect to have a high correlation. Which of the following is TRUE?
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
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
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?)
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?)
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?)
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?)
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?)
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?)
Describe what is measured by a Pearson correlation.
Describe what is measured by a Pearson correlation.
Can SP ever have a value less than zero?
Can SP ever have a value less than zero?
Which of the following statements best describes the concept of "regression toward the mean" in statistical analysis?
Which of the following statements best describes the concept of "regression toward the mean" in statistical analysis?
In null hypothesis testing, the null hypothesis (H0) typically represents:
In null hypothesis testing, the null hypothesis (H0) typically represents:
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?
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?
Which of the following is FALSE.
Which of the following is FALSE.
Increasing the number of items on a scale _____ the Cronbach's Alpha.
Increasing the number of items on a scale _____ the Cronbach's Alpha.
Which of the following is correct?
Which of the following is correct?
