<snapdata remixID="9250164"><project name="U5L3p3 Disease Spread" app="Snap! 5.4, http://snap.berkeley.edu" 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s="doIf"><custom-block s="collideWithSick?"></custom-block><script><block s="doSwitchToCostume"><l>sick</l></block><block s="doChangeVar"><l>infectedCounter</l><l>1</l></block></script></block></script></block></script></block></script></block></script><comment x="54" y="353.0000000000001" w="355" collapsed="false">5.3.3.1 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><comment x="54" y="459.0000000000001" w="332" collapsed="false">5.3.3.4 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="132.99999999999997" w="90" collapsed="false">See the hints page linked on the project page for some explanation of these blocks</comment><comment x="58" y="608.9999999999999" w="328" collapsed="false">5.3.3.5 We expect to see as N increases 10,20,...100 the duration of outbreak T to decrease because the rate of infection increases.  A graph like an exponential decay is expected.</comment></scripts></sprite><watcher var="speed" style="normal" x="10" y="10" color="243,118,29" hidden="true"/><watcher var="total" style="normal" x="10" y="52.000003999999976" color="243,118,29" hidden="true"/><watcher scope="Stage" s="getTimer" style="normal" x="113" y="5.000005999999985" color="4,148,220" hidden="true"/><watcher var="infectedCounter" style="normal" x="4" y="6.000001999999995" color="243,118,29" hidden="true"/><watcher var="precentageOfInitialInfected" style="normal" x="10" y="73.000006" color="243,118,29" hidden="true"/><watcher var="timeElapsed" style="normal" x="3.888888888888914" y="6.777783777777763" color="243,118,29"/></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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