t test formula - Easy Guides | t value formula
Whatispairedt-test?PairedStudent’st-testisusedtocomparethemeansoftworelatedsamples.Thatiswhenyouhavetwovalues(pairofvalues)forthesamesamples.Forexample,20micereceivedatreatmentXfor3months.ThequestionistotestwhetherthetreatmentXhasanimpactontheweightofthemiceattheendofthe3monthstreatment.Theweightofthe20micehasbeenmeasuredbeforeandafterthetreatment.Thisgivesus20setsofvaluesbeforetreatmentand20setsofvaluesaftertreatmentfrommeasuringtwicetheweightofthesamemice.Inthiscase,pairedt-testcanbeusedas...
What is paired t-test ?Paired Student’s t-test is used to compare the means of two related samples. That is when you have two values (pair of values) for the same samples.
For example, 20 mice received a treatment X for 3 months. The question is to test whether the treatment X has an impact on the weight of the mice at the end of the 3 months treatment. The weight of the 20 mice has been measured before and after the treatment. This gives us 20 sets of values before treatment and 20 sets of values after treatment from measuring twice the weight of the same mice.
In this case, paired t-test can be used as the two sets of values being compared are related. We have a pair of values for each mouse (one before and the other after treatment).
Paired t-test formulaTo compare the means of the two paired sets of data, the differences between all pairs must be, first, calculated.
Let d represents the differences between all pairs. The average of the difference ...