![]() New data may indicate researchers have the right idea but are wrong about things – so the hypothesis is revised, predictions made, and new experiments are designed. Drawing Conclusions: Scientists use experimental data as evidence to support, reject, or revise the hypothesis being tested, and to draw a valid conclusion. –Data analysis and sample size must be chosen carefully.ħ. Tools used to measure size & weight of marsh grasses, for example, have limited accuracy. –Researchers must be careful to avoid errors in data collection & analysis. Sources of Error – The larger the sample size, the more reliable the data. –Analysis showed that marsh grasses grew taller than controls by adding nitrogen. The dependent variable is always placed on the Y axis. ![]() The independent variable is always placed on the X axis. Like: grass growing upright or sideways.ĭata can be organized into graphs This graph shows how grass height changed over time. Qualitative data: descriptive characteristics that cannot usually be counted. Collecting and Analyzing Data Quantitative data: numbers obtained by counting or measuring: number of plants per plot, plant sizes, and growth rates. There are two main types of data: quantitative data and qualitative data.Ħ. –Scientists record experimental observations, gathering information called data. –Then they added nitrogen fertilizer (the independent variable) to the experimental plots, and observed the growth of marsh grass (the dependent variable) in both experimental and control plots. –Researchers selected plots of marsh grass with similar plant density, soil type, input of freshwater, and height above average tide level, and divided them into control and experimental groups. Write: Only ONE variable can be tested at a tiime!!! –Scientists set up several sets of control and experimental groups to try to reproduce or replicate their observations. control group: exposed to the same conditions as the experimental group except for one independent variable. –Experiments are divided into control and experimental groups. ![]() Write: the CAUSE! dependent variable (or responding variable): variable that changes in response to the independent variable. independent variable (or manipulated variable) variable that is changed by experimenter. controlled experiment: Only one variable is changed, all other variables are kept unchanged, or controlled. Scientists hypothesized that marsh grass growth is limited by available nitrogen.Ĭontrolling Variables 5. Based on the scientists knowledge of salt marshes. ![]() The inference here IS……? something limits grass growth in some places. ex: (Marsh grass grows better with more nutrients – nitrogen) Soil ASoil B Sorry you have to kind of write small on the 1 st answer hypothesis: a scientific explanation for observations that can be tested in ways that support or reject it. Prediction: (if the soil has more nutrients, then the grass will grow better) Infer: to figure out – to reason Soil ASoil BĤ. inferences: logical interpretations based on what is known. question: form questions about the observation: Why do marsh grasses grow to different heights in different places?Īfter posing questions, scientists use further observations to make: 3. (that marsh grass grows taller in some places than others.) 2. observation: act of noticing & describing events or processes in a careful, orderly way. Science is an organized way of gathering and analyzing evidence about the natural world. Scientists aim for the best understanding of the natural world that current methods can reveal. Science, Change, and Uncertainty –Learning about science means understanding what we know and what we don’t know. This constant change shows that science continues to advance. Almost every major scientific discovery raises more questions than it answers. Science, Change, and Uncertainty –Despite all of our scientific knowledge, much of nature remains a mystery. – Science rarely “proves” anything in absolute terms… it is an ongoing process. –to use those explanations to understand patterns in nature –To make useful predictions about natural events.Ĭhapter 1.1 What is Science? –Biology is not just a collection of never-changing facts or unchanging beliefs about the world. to provide natural explanations for events in the natural world. “microcephaly” is real… From “American Horror Story” From the early 1900’s “Schlitzie” the Pinheadġ.Syllabus/Parent, Guardian Signature 2.Grading 3.Class “rules” Arachnophilia = _ hint: Arachnophobia means fear of spiders. 10, 2015 Using Friday’s suffix/prefix list, find the meaning of with these words 1. Arachnophilia = _ hint: Arachnophobia."- Presentation transcript:īellwork: Monday Aug. Presentation on theme: "Bellwork: Monday Aug.
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