#1
What does a scatterplot visualize?
The relationship between two variables
ExplanationVisualizes the relationship between two variables.
#2
What does the correlation coefficient measure?
The strength and direction of a linear relationship between two variables
ExplanationMeasures strength and direction of linear relationship.
#3
What is the main purpose of using a scatterplot?
To visualize the relationship between two continuous variables
ExplanationMain purpose: visualize relationship between two continuous variables.
#4
If the correlation coefficient is close to +1, what does it indicate?
A strong positive linear relationship
ExplanationIndicates a strong positive linear relationship.
#5
What does it mean if the correlation coefficient is close to zero?
There is no relationship between the variables
ExplanationIndicates no relationship between the variables.
#6
What is the range of values the correlation coefficient can take?
From -1 to +1
ExplanationRange of correlation coefficient is -1 to +1.
#7
Which type of correlation indicates that as one variable increases, the other decreases?
Negative correlation
ExplanationNegative correlation: one variable increases, other decreases.
#8
What does it mean if the correlation coefficient is negative?
As one variable increases, the other decreases
ExplanationNegative correlation: one variable increases, other decreases.
#9
Which of the following scatterplots indicates a stronger correlation?
A scatterplot with points forming a diagonal line
ExplanationStronger correlation when points form a diagonal line.
#10
What does a correlation coefficient of 0.8 indicate?
A strong positive correlation
ExplanationIndicates a strong positive correlation.
#11
In a scatterplot, what does it mean if points are widely scattered around the line of best fit?
There is a strong correlation
ExplanationStrong correlation: points widely scattered around line of best fit.
#12
What does it mean if the correlation coefficient is -1?
There is a perfect negative linear relationship
ExplanationIndicates perfect negative linear relationship.
#13
Which of the following statements about correlation is true?
Correlation can only be calculated for quantitative variables
ExplanationCorrelation can only be calculated for quantitative variables.