<snapdata remixID="9297011"><project name="U5L2p3 Disease Spread (answer file)  " app="Snap! 5.4, http://snap.berkeley.edu" version="1"><notes></notes><thumbnail>data:image/png;base64,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</thumbnail><stage name="Stage" width="480" height="360" costume="0" color="255,255,255,1" tempo="60" threadsafe="false" penlog="false" volume="100" pan="0" lines="round" ternary="true" codify="false" inheritance="false" sublistIDs="false" scheduled="true" 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image="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAOCAYAAAAfSC3RAAABAUlEQVQ4T5WSO07DUBBFzzx/EqGYQAkFJWsA07AE1gESbAWQYBthCTR8tgAlBZTgOIKE2G+Q/RQcx3ziV87cc0dv5gqLbyU9JLPHqNkqW2Kf8M0579HlvFRqXJC84pm1hpkzeOOjvz7rVWCQWjzqRosOijKJTOlT9rrpM7Dx46Rm8YVxtOnAzlCRv4d986owWRXBT0/xOVlympNlnAlh8oAx261Aax+FcDjAyEE7UK8ENKY7umkFjnt7biPLnGLmnKNMI+PAIi25Xvy72WKjnhwVKapu4Cd3eLLzK1xAud6T9XerAFRHiglH1xiC2p8tUz57+yC3zcg1tqOxK1XieckXvJFLRgiVQEUAAAAASUVORK5CYII=" id="11"/></item></list></costumes><sounds><list struct="atomic" id="12"></list></sounds><blocks></blocks><variables></variables><scripts><script x="30" y="47"><block s="receiveGo"></block><custom-block s="initialize"></custom-block><block s="show"></block><block s="doRepeat"><block var="population size"/><script><block s="createClone"><l><option>myself</option></l></block></script></block><block s="hide"></block><custom-block s="activateTimer"></custom-block></script><script x="221" y="30"><block s="receiveOnClone"></block><custom-block s="cloneInitialize"></custom-block><block s="doForever"><script><block s="doIf"><block s="reportGreaterThan"><block var="time elapsed"/><l>0</l></block><script><block s="bounceOffEdge"></block><block s="forward"><block s="reportRandom"><l>0</l><l>5</l></block></block><block s="doIf"><block s="reportEquals"><block s="reportAttributeOf"><l><option>costume name</option></l><block s="reportGet"><l><option>self</option></l></block></block><l>healthy</l></block><script><block s="doIf"><block s="reportAnd"><block s="reportEquals"><l>1</l><block s="reportRandom"><l>1</l><l>2</l></block></block><custom-block s="collideWithSick?"></custom-block></block><script><block s="doSwitchToCostume"><l>sick</l></block><block s="doChangeVar"><l>infected counter</l><l>1</l></block></script></block></script></block></script></block></script></block></script><comment x="54" y="470.9999999999999" w="332" collapsed="false">5.2.3.4 Some of the simplifying assumptions: &#xD;1) assume population is restricted to a fixed area, in reality population always in flux moving in/out of a locality.  (think international travelers for example)&#xD;2. assume there is no healing or immunity after infection&#xD;3. assume agents continue interacting after infection, in reality the sick will either die or be restricted in movement due to laying in hospital bed etc.).&#xD;</comment><comment x="544" y="145" w="90" collapsed="false">See the hints page linked on the project page for some explanation of these blocks</comment><comment x="58" y="621" w="328" collapsed="false">5.2.3.5 One possible hypothesis:  As POPULATION SIZE increases, the duration of outbreak (TIME ELAPSED) will decrease because the rate of infection increases.  &#xD;&#xD;5.2.3.6 A graph like an exponential decay is expected.</comment><comment x="429" y="468" w="355" collapsed="false">5.2.3.1 What really matters is the population density but as the area where the population lives in the simulation is fixed, we can safely focus on the effects of population size.  A sensible hypothesis would be as population size (density) increases, the rate at which the disease spreads also increase (duration of outbreak decreases).</comment></scripts></sprite><watcher var="speed" style="normal" x="9.3125" y="9.3125" color="243,118,29" hidden="true"/><watcher scope="Stage" s="getTimer" style="normal" x="105.23125000000005" y="4.6562555874999845" color="4,148,220" hidden="true"/><watcher var="time elapsed" style="normal" x="3.6215277777778283" y="6.311811143055543" color="243,118,29"/><watcher var="doctor" style="normal" x="9.3125" y="28.86875186249999" color="243,118,29" hidden="true"/></sprites></stage><hidden></hidden><headers></headers><code></code><blocks><block-definition s="label %&apos;text&apos; of size %&apos;size&apos;" type="command" category="pen"><comment x="0" y="0" w="90" collapsed="false">LABEL will stamp text on the stage at the given font size. 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%l"><block s="reportCDR"><block var="words"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="words"/></block></block></script></block><block s="doIf"><block s="reportEquals"><l></l><block s="reportListItem"><l>1</l><block var="words"/></block></block><script><block s="doReport"><custom-block s="join words %mult%txt"><block s="reportCDR"><block var="words"/></block></custom-block></block></script></block><block s="doIf"><block s="reportEquals"><l></l><block s="reportListItem"><l>2</l><block var="words"/></block></block><script><block s="doReport"><custom-block s="join words %mult%txt"><block s="reportCONS"><block s="reportListItem"><l>1</l><block var="words"/></block><block s="reportCDR"><block s="reportCDR"><block var="words"/></block></block></block></custom-block></block></script></block><block s="doReport"><block s="reportJoinWords"><list><block s="reportListItem"><l>1</l><block var="words"/></block><l> </l><custom-block s="join words %mult%txt"><block s="reportCDR"><block var="words"/></block></custom-block></list></block></block></script></block></script><scripts><script x="229.00000300000002" y="196.77778077777774"><block s="reportJoinWords"><list><l></l><l></l></list></block></script></scripts></block-definition><block-definition s="list $arrowRight sentence %&apos;data&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doReport"><custom-block s="join words %mult%txt"><block var="data"/></custom-block></block></script></block></script></block-definition><block-definition s="sentence $arrowRight list %&apos;text&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%txt"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportTextSplit"><block var="text"/><l><option>whitespace</option></l></block></block></script></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%cs"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doRun"><block var="action"/><list></list></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;cont&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input></inputs><script><block s="doRun"><block var="cont"/><list></list></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;value&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%anyUE"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doReport"><block s="evaluate"><block var="value"/><list></list></block></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;tag&apos; %&apos;value&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input><input type="%s"></input></inputs><script><block s="doRun"><block var="tag"/><list><block var="value"/></list></block></script></block-definition><block-definition s="for each %&apos;item&apos; of %&apos;data&apos; %&apos;action&apos;" type="command" category="lists"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%l"></input><input type="%cs"></input></inputs><script><block s="doUntil"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doSetVar"><l>item</l><block s="reportListItem"><l>1</l><block var="data"/></block></block><block s="doRun"><block var="action"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="doSetVar"><l>data</l><block s="reportCDR"><block var="data"/></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; do %&apos;action&apos; and pause all $pause-1-255-220-0" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%boolUE"></input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>breakpoint</l></list></block><block s="doIf"><block s="evaluate"><block var="test"/><list></list></block><script><block s="doSetVar"><l>breakpoint</l><block var="test"/></block><block s="doShowVar"><l>breakpoint</l></block><block s="doRun"><block var="action"/><list></list></block><block s="doPauseAll"></block><block s="doHideVar"><l></l></block></script></block></script></block-definition><block-definition s="word $arrowRight list %&apos;word&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%txt"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportTextSplit"><block var="word"/><l><option>letter</option></l></block></block></script></block></script></block-definition><block-definition s="ignore %&apos;x&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs></block-definition><block-definition s="tell %&apos;sprite&apos; to %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="action"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask %&apos;sprite&apos; for %&apos;expression&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%repRing"></input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="expression"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="list $arrowRight word %&apos;list&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportJoinWords"><block var="list"/></block></block></script></block></script></block-definition><block-definition s="activateTimer" type="command" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doResetTimer"></block><block s="doUntil"><block s="reportEquals"><block var="infected counter"/><block var="population size"/></block><script><block s="doSetVar"><l>time elapsed</l><block s="getTimer"></block></block></script></block><block s="doStopThis"><l><option>all but this script</option></l></block></script></block-definition><block-definition s="initialize" type="command" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doSetVar"><l>time elapsed</l><l>0</l></block><block s="doSetVar"><l>infected counter</l><l>0</l></block><block s="gotoXY"><l>0</l><l>0</l></block><block s="doAsk"><l>How many people in the population? Enter 1-200.</l></block><block s="doSetVar"><l>population size</l><block s="getLastAnswer"></block></block><block s="doAsk"><l>What percentage of the population is infected initially? Enter 1-100.</l></block><block s="doSetVar"><l>percent initially sick</l><block s="getLastAnswer"></block></block></script></block-definition><block-definition s="cloneInitialize" type="command" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doSwitchToCostume"><l>healthy</l></block><block s="doIf"><block s="reportLessThan"><block var="infected counter"/><block s="reportProduct"><block var="population size"/><block s="reportQuotient"><block var="percent initially sick"/><l>100</l></block></block></block><script><block s="doSwitchToCostume"><l>sick</l></block><block s="doChangeVar"><l>infected counter</l><l>1</l></block></script></block><block s="setHeading"><block s="reportRandom"><l>1</l><l>360</l></block></block><block s="gotoXY"><block s="reportRandom"><l>-240</l><l>240</l></block><block s="reportRandom"><l>-180</l><l>180</l></block></block></script></block-definition><block-definition s="collideWithSick?" type="predicate" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><custom-block s="for each %upvar of %l %cs"><l>item</l><block s="reportGet"><l><option>neighbors</option></l></block><script><block s="doIf"><block s="reportAnd"><block s="reportTouchingObject"><block var="item"/></block><block s="reportEquals"><block s="reportAttributeOf"><l><option>costume name</option></l><block var="item"/></block><l>sick</l></block></block><script><block s="doReport"><block s="reportBoolean"><l><bool>true</bool></l></block></block></script></block></script></custom-block><block s="doReport"><block s="reportBoolean"><l><bool>false</bool></l></block></block></script></block-definition><block-definition s="collideWithDoctor?" type="predicate" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doIfElse"><block s="reportTouchingColor"><color>45,255,38,1</color></block><script><block s="doReport"><block s="reportBoolean"><l><bool>true</bool></l></block></block></script><script><block s="doReport"><block s="reportBoolean"><l><bool>false</bool></l></block></block></script></block></script></block-definition></blocks><variables><variable name="speed"><l>2</l></variable><variable name="population size"><l>100</l></variable><variable name="percent initially sick"><l>2</l></variable><variable name="time elapsed"><l>14.5</l></variable><variable name="infected counter"><l>100</l></variable><variable name="doctor"><l>3</l></variable></variables></project><media name="U5L2p3 Disease Spread (answer file)  " app="Snap! 5.4, http://snap.berkeley.edu" version="1"></media></snapdata>