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1a Lab Template for Experimental Design & Handling Data in secondary school Experimental Design Diagram = A visual layout of key parts of a controlled experiment: Name: ……………………………………………………………………. Class & Stream ……………… Submission Date: ……………………… Time: …………………… Title: The ………………………………………..…………………………………………………………………………………..………………………………………………………………………………. Hypothesis (is PREDICTION but a SCIENTIFIC EXPLANATION is ADDED at the END – starting with word “because”): If ……………………………………………………………………………………………..….., then ……………………………………………………………………………………………….. Because ……………………………………………………………………………………………………………………………………………………………………………………………………… Variables (things that can change and affect experimental outcome): 1. Measuring Variables: a. Dependent variable & how to measure it (instrument + unit) ……………………………………………………………………………………………………………………………………………………………………………………………….…… Values of Independent Variable in Control Group, IV Experimental Group & Numbers of Repeated Trials: Control Group Number of trial Trial 1 Trial 2 Trial 2 Trial 1 Trial 2 Trial 2 Value of Independent Variable Experimental Group Number of trial Value of Independent Variable NB: o the closer the intervals between the levels of independent variables, the likelihood of getting a more accurate o outcome (just like the smaller the divisions the calibrations of an instrument, the more accurate the instrument is); This can be an exam point when asked to improve accuracy of results in some questions! o o o o one of the levels of independent variable will serve as the control for the experiment. Set-ups with the control = control group this group is not treated with independent variable (IV not applied) or independent variable is not manipulated but left at natural levels The other se-ups are experimental group b. Dependent variable and how is measure it (instrument + unit): ..…………………………………………………………………………………………………………………………………………………………………………………….…………… 2. 3. Controlling Variables (controlled variables/Constants/ factors kept same in all set-ups) ………………………………………………………………………………………………………………………………………………………………………………………………….. …………………………………………………………………..…………………………………………………………………………………………………………………..……….. …………………………………………………………………..…………………………………………………………………………………………………………………………….. ………………………………………………………………………………………………………………………………………………………………………………………………….. State two safety hazards & safety precautions taken: Hazard ……………………………………. Safety precaution to be taken: …………………………………………………………………………………………………. Hazard ……………………………………. Safety precaution to be taken: …………………………………………………………………..……………………………. Page 1 of 2 Method/Procedure (short sentences + annoted diagram): Observations during experiment: ..................…………………………………………………………………………………………………………………………………………………………………………………….…… ..................…………………………………………………………………………………………………………………………………………………………………………………….…… ..................…………………………………………………………………………………………………………………………………………………………………………………….…… Data Collection Table of results Data analysis: Conclusion: Based on analysed data, answering the question that you started with that lead to the hypothesis; then rejecting or accepting hypothesis; ..................…………………………………………………………………………………………………………………………………………………………………………………….…… ..................…………………………………………………………………………………………………………………………………………………………………………………….…… State the weaknesses / sources of errors (only mention experimental errors or experimenter’s error) 1. Source of error/ weakness: ……………………………………………………………………………………………………………………………………………………………………………………………………….. What can be done to improve the investigation/minimise the errors: 2. ……………………………………………………………………………………………………………………………………………………………………………………………………….. Source of error/ weakness: ……………………………………………………………………………………………………………………………………………………………………………………………………….. What can be done to improve the investigation/minimise the errors: ……………………………………………………………………………………………………………………………………………………………………………………………………….. Page 2 of 2