Post on 20-Jun-2015
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Null-hypothesis for a Point Biserial
Conceptual Explanation
With hypothesis testing we are setting up a null-hypothesis –
With hypothesis testing we are setting up a null-hypothesis – the probability that there is no effect or relationship –
With hypothesis testing we are setting up a null-hypothesis – the probability that there is no effect or relationship – and then we collect evidence that leads us to either accept or reject that null hypothesis.
As you may recall, a Point-Biserial Correlation is a value that makes it possible to statistically test the relationship between a dichotomous variable and a continuous variable.
As you may recall, a Point-Biserial Correlation is a value that makes it possible to statistically test the relationship between a dichotomous variable and a continuous variable.
PersonDepressed 1 = not depressed2 = depressed
Amount of Shame
A 1 10
B 1 9
C 1 10
D 2 2
E 2 2
As you may recall, a Point-Biserial Correlation is a value that makes it possible to statistically test the relationship between a dichotomous variable and a continuous variable.
PersonDepressed 1 = not depressed2 = depressed
Amount of Shame
A 1 10
B 1 9
C 1 10
D 2 2
E 2 2
either / or
As you may recall, a Point-Biserial Correlation is a value that makes it possible to statistically test the relationship between a dichotomous variable and a continuous variable.
PersonDepressed 1 = not depressed2 = depressed
Amount of Shame
A 1 10
B 1 9
C 1 10
D 2 2
E 2 2
As you may recall, a Point-Biserial Correlation is a value that makes it possible to statistically test the relationship between a dichotomous variable and a continuous variable.
PersonDepressed 1 = not depressed2 = depressed
Amount of Shame
A 1 10
B 1 9
C 1 10
D 2 2
E 2 2
takes on many values
Here is a template for writing a null-hypothesis for a Point-Biserial Correlation:
Here is a template for writing a null-hypothesis for a Phi-Coefficient:
There is no statistically significant relationship between the [insert variable] and [insert variable].
Example 1
A researcher wishes to determine if a significant relationship exists between height and college graduation rates.
ProblemA researcher wishes to determine if a significant relationship exists between height and college graduation rates.
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert independent variable] and [insert dependent variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert independent variable] and [insert dependent variable].
ProblemA researcher wishes to determine if a significant relationship exists between height and college graduation rates.
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert independent variable] and [insert dependent variable].
ProblemA researcher wishes to determine if a significant relationship exists between height and college graduation rates.
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert independent variable] and [insert dependent variable].
ProblemA researcher wishes to determine if a significant relationship exists between height and college graduation rates.
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert variable] and [insert variable].d
ProblemA researcher wishes to determine if a significant relationship exists between height and college graduation rates.
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert variable] and [insert variable].s
ProblemA researcher wishes to determine if a significant relationship exists between height and college graduation rates.
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the student height and [insert variable].s
ProblemA researcher wishes to determine if a significant relationship exists between height and college graduation rates.
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the student height and [insert variable].s
ProblemA researcher wishes to determine if a significant relationship exists between height and college graduation rates.
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the student height and college graduation rates.s
Null-hypothesis for this ProblemThere is no statistically significant relationship between the student height and college graduation rates.
Example 2
A researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
A researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
vs.
vs.
ProblemA researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert independent variable] and [insert dependent variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert independent variable] and [insert dependent variable].
ProblemA researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert independent variable] and [insert dependent variable].
ProblemA researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert independent variable] and [insert dependent variable].
ProblemA researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert variable] and [insert variable].s
ProblemA researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert variable] and [insert variable].s
ProblemA researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the [insert variable] and [insert variable].s
ProblemA researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the head circumference and [insert variable].s
ProblemA researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the head circumference and [insert variable].s
ProblemA researcher wishes to determine if a significant relationship exists between head circumference and political affiliation (Democrat vs. Republican).
Template for a Phi-Coefficient Null-HypothesisThere is no statistically significant relationship between the [insert variable] and [insert variable].
Null-hypothesis for this ProblemThere is no statistically significant relationship between the head circumference and political affiliation.s
Null-hypothesis for this ProblemThere is no statistically significant relationship between the head circumference and political affiliation.