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Today’s Objective To collect and analyze our handwashing results, consider what they show and draw a conclusion about what our data means Bacterial In Photos Observations • • • • Did bacteria grow on your plate? Where? All one kind or different types? How much? How can bacteria be measured? Is there a pattern to the growth? Which handwashing techniques had more? Which had different types? Using scientific methods • Scientists often quantify their data to aid in analysis • Graph paper can be used to count colonies or estimate percentage of agar covered by bacteria Creating tables to organize data Handwashing Technique 1 2 3 4 Observations % of Bacteria in quadrant Sharing Class Data Handwashing Technique Group 1 Group 2 Group 3 Group 4 Group 5 Note: This year, we will use Google docs and Excel to collect, analyze, and share class data Group 6 Let’s try it with our class data • Do our class results make sense? • Are the results what you expected/predicted? • Are there any errors that may have affected our results? • What can we do next time to design a better experiment? Analyzing or graphing our data can help us find a trend Can you make a trend statement for this data? Components of a good graph • • • • • Appropriate type of graph (bar, line, piechart) Title Labels on axes Units on axes Written trend statement/caption under graph • Key? Connecting Experimental Design, Hypotheses, And Graphs! • (IF) Independent Variable: condition or situation you will set up • (THEN) Dependent Variable: – Must be quantitative – the NUMBER that you will record • (BECAUSE) Rationale: scientific concept or research that is connected to your prediction IF/THEN hypothesis should reflect your research question • Hypothesis predicts how variables will change • IF hot soapy water is used, THEN less bacteria will grow Data collection should reflect your question • Independent Variable (xaxis) = • Dependent Variable (yaxis) =