Chi-square test

1.  Make a conjecture about some facet of sports.
a.  For example, “Curtis Granderson is a less good hitter when facing left-handed pitching.”
b.  Choose an example with a clear, dichotomous definition of success; e.g. “he gets a hit, not an out.”  This is your dependent variable, and it is given in the columns of the table.
c.  The independent variable (e.g. type of pitching) goes in the rows of the table.  It must also be dichotomous for this assignment.
2.  Write you hypothesis in the space provided on the assignment template.
3.  Write the null hypothesis in the space provided.
4.  Enter which variable is the independent and which is the dependent (success or failure).
5.  Gather the relevant data.  Enter the source of the data in the space provided.
6.  Enter the data in the table on the assignment sheet.
a.  Again, independent variable on the rows; dependent variable on the columns.
7.  Go to http://www.quantitativeskills.com/sisa/statistics/fisher.htm
8.  Enter the data and calculate the chi square statistics.
9.  Enter the p value.
a.  We want the two sided p value, which is starred – not the one based on the “Pearson statistic.”
9.  Interpret your results in the space provided.

Name  ___________________________

Assignment Sheet
Chi-square test

Hypothesis:

Null hypothesis:

Independent variable        _____________________

Dependent variable        _____________________

Source of data            _____________________

Table

________________        __________________

_____________

______________

p-value                __________________

Interpretation