Chi | Chi-square test example
Single:47 Married:71 Divorced:35 Single:44 Married:85 Divorced:40 GroupsandNumbersYouresearchtwogroupsandputthemincategoriesofsingle,marriedordivorced: Thenumbersaredefinitelydifferent,but...Isthatjustrandomchance?Orhaveyoufoundsomethinginteresting? TheChi-SquareTest givesa"p"valuetohelpyoudecide!Example:"Whichholidaydoyouprefer?" BeachCruiseMen209280Women225248DoesGenderaffectPreferredHoliday?IfGender(ManorWoman)doesaffectPreferredHolidaywesaytheyaredependent.Bydoingsomespecialcalculations(...
Single: 47 Married: 71 Divorced: 35 Single: 44 Married: 85 Divorced: 40 Groups and NumbersYou research two groups and put them in categories of single, married or divorced:
The numbers are definitely different, but ...
Is that just random chance? Or have you found something interesting?
The Chi-Square Test gives a "p" value to help you decide!
Example: "Which holiday do you prefer?" Beach Cruise Men 209 280 Women 225 248 Does Gender affect Preferred Holiday?If Gender (Man or Woman) does affect Preferred Holiday we say they are dependent.
By doing some special calculations (explained later), we come up with a "p" value:
p value is 0.132
Now, p < 0.05 is the usual test for dependence.
In this case p is great...