parts . ▁ ▁This ▁is ▁because ▁whereas ▁proof ▁co ins ▁are ▁almost ▁always ▁carefully ▁preserved ▁by ▁their ▁own ers , ▁business ▁strik es ▁usually ▁are ▁not . ▁ ▁Category : Co ins <0x0A> </s> ▁T ink er Pl ots ▁is ▁expl or atory ▁data ▁analysis ▁and ▁model ing ▁software ▁designed ▁for ▁use ▁by ▁students ▁in ▁gr ades ▁ 4 ▁through ▁university . ▁It ▁was ▁designed ▁by ▁Cl iff ord ▁Kon old ▁and ▁Craig ▁Miller ▁at ▁the ▁University ▁of ▁Massachusetts ▁Am her st ▁and ▁is ▁currently ▁published ▁by ▁the ▁Lear n ▁Tro op . ▁ ▁It ▁runs ▁on ▁Windows ▁XP ▁or ▁later ▁and ▁Mac ▁OS ▁ 1 0 . 4 ▁or ▁later . ▁The ▁program ▁allows ▁users ▁to ▁enter ▁their ▁own ▁data , ▁to ▁import ▁them ▁from ▁other ▁applications ▁or ▁the ▁Web , ▁or ▁to ▁generate ▁them ▁using ▁a ▁sampling ▁engine . ▁ ▁The ▁program ▁also ▁comes ▁with ▁ 5 0 ▁mult ivari ate ▁data ▁sets . ▁ ▁Using ▁T ink er Pl ots , ▁students ▁can ▁make ▁a ▁large ▁variety ▁of ▁graphs , ▁including ▁those ▁specified ▁for ▁middle ▁school ▁in ▁Common ▁Core ▁State ▁Stand ards ▁for ▁Mathemat ics ▁But ▁rather ▁than ▁making ▁these ▁graphs ▁directly ▁using ▁commands , ▁students ▁construct ▁them ▁by ▁progress ively ▁organ izing ▁cases ▁using ▁basic ▁operations ▁including ▁“ stack ,” ▁“ order ,” ▁and ▁“ separ ate .” ▁ ▁Res pond ing ▁to ▁these ▁operations , ▁case ▁icons ▁animate ▁into ▁different ▁screen ▁positions . ▁ ▁The ▁interface ▁was ▁based ▁on ▁observations ▁of ▁people ▁organ izing ▁“ data ▁cards ”