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Identifying Variables Worksheet Instructions: For the following experiments, identify and describe the (IV) independent variable, (DV) dependent variable, (CG) control group, and (Con) the constant. 1) Different rose bushes are grown in a greenhouse for two months. The number of flowers on each bush is counted at the end of an experiment.
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designing an experiment, collecting and analyzing data, and drawing a conclusion. This is sometimes also referred to as scientific inquiry. A hypothesis is a possible explanation for an observation. A good scientist will design a controlled experiment to test their hypothesis. In a controlled experiment, only one variable is tested at a time.
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Scientific method worksheets, lab skills and graphing lesson plans that are designed for high school, middle school, and elementary school life science teachers are downloadable here for free. Data analysis worksheets help students learn the basics of graphing and trends. Experimental variable worksheets allow students to practice identifying ...
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- Objectives
- Outline
- Background information
- Trueness
- Introducing the vocabulary to the class
- The weighing experiment (method 1)
- Interpreting the results
- The weighing experiment (method 2)
- Interpreting the results
- Calibrating equipment
- Class experiment
- Smarties and Milky Bar Buttons
- Bulls eye to win
- Interpreting the weighing experiment (method 1)
- Teachers’ notes
Understand that data obtained during experiments are subject to uncertainty. Understand that the level of accuracy is linked to the context. Planning experiments and investigations. Making accurate observations. Evaluating data, considering anomalous results.
The teaching material is divided into three sections, all of which focus on an aspect of accuracy and precision. Each activity stands alone and is independent of the other two. Measuring uncertainties and reporting reliable results Choosing and using equipment Does being accurate really matter?
Students (including post-16 students) are often confused about the meanings and difference between some of the vocabulary in regular use eg Accuracy and precision Repeatability and reproducibility Systematic error and true value Error and mistake Best fit line and anomalous points. Definitions Accurate – the result is close to a reference value or ...
Trueness is defined as: The difference between the observed mean value and the reference value. A true value is never achievable because there is always some random variation and it is recommended that the indefinite article is always used ie ‘a’ and not ‘the’. Figure 3 Accuracy, precision and trueness Observed mean value Systematic error (called b...
Professional judgement should be used here to decide how many terms it is appropriate to introduce to each class. The list of definitions given above is meant to be a comprehensive list to aid teaching at all levels. There are several ways of introducing the terms to the class: List some of the words on the board and ask the students to write down ...
Set up the balances at different places in the room. Divide the class into groups. Present the class with some common identical objects – eg Mars® Bars. Each group weighs several Mars® Bars, using one weighing device. They then record the results and the weighing device used. They work out the average mass of a Mars® Bar. Add the result to the clas...
The results show a scatter close to a true value of the object (see Figure 4). You need to draw in the line of best fit and highlight any anomalous results. This approach is built on the assumption that all the Mars® Bars are the same mass, and that balances are the only variable. Any difference in the mass of the actual Mars® Bars will be minimise...
As homework, ask the class to weigh the same object, such as a Mars® Bar, three times on their kitchen scales. Record the mass of the object each time they weigh it. Work out the average mass. Bring the object into school. Reweigh the object using a balance at school. Add the result to the class table or graph (on the board or OHP). Plot the class ...
The results should show a scatter close to the declared value of the mass of the object. Manufacturers are given a tolerance on their products and therefore there is no true value or reference value. (Refer to notes in background information.) There will be a scatter of results, because in practice not all Mars®Bars will weigh exactly the same. You...
This should take the form of a teacher demonstration and discussion, and could be used in the final stage of the lesson. Some teachers may want their students to carry this out for themselves because it really depends on the quantity and quality of your balances. If available you could use a range of balances that read to a different number of deci...
You may wish to add in an anomalous result, which could be used to discuss systematic errors later in the lesson. This could also save students from embarrassment, if there was only one other anomalous result. But in practice kitchen scales often provide the anomalous results. This could be checked before the lesson.
These are packed by mass rather than by the number of sweets. The manufacturing process is a fast and highly automated one and it is impossible to pack exactly the same quantity into each pack. As with any average there will be some packs with above average mass and some below. All packs will, however, be above an agreed minimum level.
Jamal The bulls eye a) David, b) Helen, c) Jamal, d) Marie David Try an aim a bit lower and further over towards the right.
From the graph produced what is the mass of the Mars®Bar? What is the expected value of the mass of the Mars® Bar? (Look at the wrapper.) Is there a difference between the measured value and the expected value? What is the size of the difference? How would you write down the mass to include this error? How can you explain the difference in results?...
Many students have difficulty choosing the best apparatus to carry out the experiments and investigations. The worksheet Choosing and using equipment is designed to help in this.
Go through questions 2–4 using the answers below as a guide and pointing out the difference between observation and inference. 5. Return to Tricky tracks 1 and ask learners to answer question 5 (slide 10) focussing on observation only. 6. Finally, link this exercise to science in the real world, saying that scientists often make similar ...
Purpose of experiments or scientific investigations in the science classroom: An experiment can provide proof of a theory, and A Scientific investigation is used to determine a relationship between different variables and to confirm or reject a hypothesis. To determine the relationship between variables you must alter ONE variable and
Jul 8, 2021 · Learn and download free scientific method worksheets for kids. 20+ worksheets, sample experiments, and process explanations. In this article, let’s discuss how kids can use Scientific method to resolve real-life problems. In simple terms, the scientific method is a method or procedure which combines the aspects of observation, measurement ...
