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Experimental design Bubbles!. Title Your choice It should have something to do with your experiment.

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Presentation on theme: "Experimental design Bubbles!. Title Your choice It should have something to do with your experiment."— Presentation transcript:

1 Experimental design Bubbles!

2 Title Your choice It should have something to do with your experiment

3 Problem or purpose What are your trying to find out? Something to do with the bubbles? Brands? Things added to the solutions?

4 Materials A complete list of materials needed to do the experiment

5 Procedure A detailed list of exactly what you did.

6 Procedure cont.

7 Data Chart the findings Record observations as the experiment is happening. observations 1 floated, started to break down at 2 min 2 34

8 Cost of soap Ajax: $1.87 – 30 oz Dawn: $2.83 – 24 oz Great Value: $1.97 – 24 oz Palmolive $2.64 – 25 oz Gain $1.97 – 30 oz

9 Data Analysis Organize the data: graphs, charts, ranges, mean, median, mode etc.

10 Conclusion How do the results relate to the original problem? What were some possible errors in your procedure? Timing? Temp? Number of repetitions? Amount of water? Control? Was there only one variable? How could this experiment be improved? Extensions: How could this info be useful in real life? What might it mean? Does it make you come up with another hypothesis?

11 Share your Results Turn in your formal write up.

12 LAB REPORT FORMAT Note: all lab reports are to utilize this format (discrete sections, labeled as below, are mandatory). Reports are to use formal language; avoid using the words we, I, us, our, etc. The report should have a title, your names, the date, and your class period. Conserve paper! Use both sides and eliminate unnecessary extra spacing.

13 INTRODUCTION I. Describe the general rationale for your investigation (Why is this being done? Why is this an important study? What can we learn or apply from this?). -Provide all appropriate background information for reader. -Clearly state the purpose of your investigation. -State hypothesis or hypotheses (null and alternative are often appropriate

14 Materials and Methods (Procedure) II. -List the materials used in your investigation. -List (and describe, if appropriate) the procedures employed. This should be in list form, NOT a paragraph. Do not describe standard techniques such as massing or transferring fluids.

15 Remember that your goal is to provide sufficient information so that your investigation: 1. can be readily reproduced 2. can be evaluated for errors, limitations, etc. so that any conclusions can be assessed for believability (confidence). -If the procedure was provided prior to your investigation, you may simply attach it to your report. It is important to describe any changes which may have occurred from this protocol.

16 III. RESULTS -Present all data in clear and concise forms (at times, graph paper or other materials may be provided for this purpose). If calculations are involved, show all work or work through one problem to illustrate. -Make certain that all charts, graphs, tables, etc. are clearly titled and labeled. -Highlight trends or significant results for the reader (do not repeat all data in prose form). -This section may also include a statistical analysis of your data.

17 IV. CONCLUSIONS -Evaluate data in light of your hypothesis. Be careful with your choice of words; avoid the word prove! -Interpret and analyze your data for the reader. Offer possible explanations or reasons for your obtained data.

18 -In light of your materials and procedure, evaluate your experiment. Describe the sources of possible error or the limitations of your materials or procedure. Suggest means of reducing these errors. Suggest improvements and include suggestions for further possible studies (how could this study be extended to provide relevant information?).

19 Lab Test RubricName/Names ____________________________________________________ Standards: The levels at which students are expected to perform the task scoretopicAdvanced (5)Proficient (3)Needs Improvement (1) QuestionQuestion is narrowly focused and suggests how an answer might be investigated. It is answerable. Question is answerable but not narrowly focused. Question is too broad and not practically investigated. Identificatio n of Variables Correctly identifies specific, measurable independent and dependent variables. Identifies variable being tested & variable being measured.. Variables and constants significantly incomplete &/or inaccurate. HypothesisHypothesis is testable and clearly stated in If … then … format. Specifically predicts relationship between dependent and independent variables. Hypothesis is clearly stated. It predicts the influence of one variable on another. Hypothesis is poorly stated and doesn t directly mention the variables. MaterialsComplete, detailed list of materials (size, conc., quantity) presented in vertical list format Most materials are listed and appropriate. Materials quite incomplete or inappropriate for experiment. ProcedureAccurately tests the hypothesisAttempts to test hypothesisDoes not address hypothesis. Conducts or analyzes at least 3 trials.Multiple trials attempted or need is recognized. Single trial, poor understanding of use of multiple trials. Procedure is in vertical list format, accurate, complete, easy to- follow, and reproducible by another person. Includes diagrams to clarify procedures Step-by-step procedure, generally Complete. Minor errors/ omissions make it difficult to follow or not always repeatable Procedure difficult to follow Major omissions or errors. Includes all appropriate safety concerns. Includes critical safety concerns Safety concerns trivial or inadequately addressed.

20 Data Collection & Presentation Data table contains accurate, precise raw data & summary data reported in correct SI units with descriptive title. Data table with accurate data, most units labeled or implied. Minor errors. Title absent or trivial. Data table inaccurate, confusing, and/or incomplete. Missing units. Data summarized in well organized, easy-to-read graph &/or figures. Descriptive title, appropriate labeling, keys, etc. Data displayed in well organized easy to read graph &/or figures. Descriptive title, minor errors in use of units and labeling. Graph/figures presented in a confusing and/or sloppy fashion. Data summarized in a clear, concise, logical manner Patterns identified & described, but no conclusions drawn. Reasonable, but somewhat unclear summary of data. Patterns in data not clearly identified. Summary is unclear and illogical. Patterns in data not identified. ConclusionScientifically valid, logical conclusion, well supported by the data collected. Clearly addresses problem and stated hypothesis. Scientifically valid, logical conclusion, supported by data collected. Attempts to address problem and stated hypothesis. Conclusion is incomplete or illogical. Does not address the problem and hypothesis. Sources of error identified and explained. Appropriate recommendations made to eliminate errors. Sources of error identified Weak/trivial attempt to identify sources of error. Student generates specific questions for future study Student makes attempt to generate questions for future study. Student makes incomplete or inappropriate attempt to extend or apply knowledge.

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