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Example:油PAIRED油T足TEST油
It油is油thought油that油the油glycaemic油index油(GI)油of油food油is油an油indicator油of油how油sustaining油
or油satisfying油it油is油and油may油influence油appetite.油

A油sample油of油children油were油provided油with油a油breakfast油of油low油GI油foods油on油one油day油
and油high油GI油foods油on油another.油The油two油breakfasts油contained油the油same油quantities油
of油carbohydrate,油fat油and油protein.油On油each油day油a油buffet油lunch油was油provided油and油
the油number油of油calories油eaten油at油lunchtime油were油recorded.油

On油the油first油day油the油children油ate油a油low油GI油breakfast油and油on油the油second油day油a油high油
GI油breakfast.油The油objective油is油to油determine油whether油the油kind油of油breakfast油eaten油
has油an油effect油on油mean油calorie油intake.油

The油table油below油summarises油the油data油for油children油in油the油sample.油This油shows油that油
for油the油children油in油the油experiment,油mean油calorie油intake油at油lunchtime油was油higher油
after油the油high油GI油breakfast.油A油hypothesis油test油is油needed油to油determine油whether油
these油results油mean油that油we油can油predict油that油there油would油be油differences油in油mean油
calorie油intake油for油other油children油who油ate油low油and油high油GI油breakfasts.油

                                 Paired油Samples油Statistics油


                                                                                      Std.油Error油
                                         Mean油          N油          Std.油Deviation油     Mean油
 kcal油after油low油gi油breakfast油           607.9697油             33油      182.82445油      31.82565油
 kcal油after油high油gi油breakfast油          771.6061油             33油      222.10779油      38.66400油

The油hypotheses油to油test油are:油

Null油hypothesis油(H0):油Mean油calorie油intake油is油the油same油following油low油or油high油GI油
breakfast油

Alternative:油(H1):油Mean油calorie油intake油depends油on油whether油a油low油or油high油GI油
breakfast油was油eaten油


A油paired油t足test油is油appropriate油because:油

(1)油     two油related油samples油are油being油compared.油The油samples油are油related油
         because油the油same油group油of油children油tested油both油breakfasts油

(2)油     the油dependent油variable,油that油is,油the油calorie油intake,油is油a油continuous油variable油

The油next油table油shows油the油result油of油the油paired油t足test油油this油allows油us油to油draw油
conclusions油about油the油population油of油children油from油which油the油sample油was油drawn.油
The油key油outputs油are油the油test油statistic,油the油degrees油of油freedom油and油the油P足value.
Paired油Samples油Test油

                                                          Paired油Differences油
                                                                                  95%油Confidence油
                                                                                   Interval油of油the油
                                                                 Std.油Error油         Difference油
                                    Mean油      Std.油Deviation油     Mean油         Lower油      Upper油     t油       df油         Sig.油(2足tailed)油
 Pair油   kcal油after油low油gi油
 1油      breakfast油足油kcal油after油   足163.636油     186.40762油      32.44940油      足229.734油 足97.53910油   足5.043油         32油             .000油
         high油gi油breakfast油



SPSS油calculates油the油P足value油from油the油test油statistic油and油the油degrees油of油freedom油
and油reports油it油to油3油decimal油places.油The油actual油value油of油P油is油0.0000175.油This油is油so油
small油that油when油reported油to油three油decimal油places,油it油is油shown油as油0.000油which油we油
report油as油P油<油0.001.油Because油the油P足value油is油less油than油0.05,油we油have油statistically油
significant油evidence油that油mean油calorie油intake油at油lunchtime油depends油on油whether油a油
childs油breakfast油had油a油low油or油high油GI.油
Although油our油conclusion油is油based油wholly油on油the油P足value,油the油convention油is油to油
report油the油value油of油t油and油the油df油as油well.油

The油hypothesis油test油allows油you油to油say:油
The油kind油of油food油eaten油at油breakfast油has油a油statistically油significant油effect油on油mean油
calorie油consumption油(油t=油足5.043,油df=油32,油P油<油0.001).油

The油confidence油interval油allows油you油to油say:油
We油are油95%油confident油that油eating油a油low油GI油breakfast油reduces油childrens油mean油
calorie油consumption油at油lunchtime油by油between油98油and油230油kcal油(to油the油nearest油
whole油number).油

Assumptions油underlying油the油test油
The油paired油t足test油is油based油on油the油assumption油that油if油you油calculate油the油difference油in油
calorie油intake油following油low油and油high油GI油breakfasts油for油each油child,油the油results油are油
Normally油distributed.油If油there油are油major油problems油then油the油results油of油the油test油can油
be油unreliable.油This油can油be油checked油by油plotting油the油differences油between油intakes油
following油low油and油high油GI油breakfasts油on油a油P足P油plot.油This油is油a油graph油that油is油
specially油designed油to油detect油departures油from油the油Normal油distribution油(which油
appear油as油deviations油from油the油45油degree油line).油If油the油data油does油not油support油the油
Normality油assumption,油then油the油problem油can油be油solved油either油by油using油an油
alternative油test,油such油as油the油Wilcoxon油test油or油by油transforming油the油data.
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Example paired ttest