Difference between revisions of "Valid"
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====Valid Experiment==== | ====Valid Experiment==== | ||
: [[Hypothesis]] - The [[extension]] of a [[Coil Spring|spring]] is [[Directly Proportional|directly proportional]] to the [[force]] applied to the [[Coil Spring|spring]]. | : [[Hypothesis]] - The [[extension]] of a [[Coil Spring|spring]] is [[Directly Proportional|directly proportional]] to the [[force]] applied to the [[Coil Spring|spring]]. | ||
− | : Method - Attach different known [[weight]]s to the [[Coil Spring|spring]] and [[measure]] the [[extension]] of the [[Coil Spring|spring]]. | + | : '''Valid''' Method - Attach different known [[weight]]s to the [[Coil Spring|spring]] and [[measure]] the [[extension]] of the [[Coil Spring|spring]]. |
====Invalid Experiment==== | ====Invalid Experiment==== | ||
: [[Hypothesis]] - The [[extension]] of a [[Coil Spring|spring]] is [[Directly Proportional|directly proportional]] to the [[force]] applied to the [[Coil Spring|spring]]. | : [[Hypothesis]] - The [[extension]] of a [[Coil Spring|spring]] is [[Directly Proportional|directly proportional]] to the [[force]] applied to the [[Coil Spring|spring]]. | ||
− | : Invalid Method 1 - Attach different known [[weight]]s to an elastic band and [[measure]] the [[extension]] of the elastic band. | + | : '''Invalid''' Method 1 - Attach different known [[weight]]s to an elastic band and [[measure]] the [[extension]] of the elastic band. |
− | : Invalid Method 2 - Attach different known [[weight]]s to the [[Coil Spring|spring]] and [[measure]] the [[width]] of the [[Coil Spring|spring]]. | + | : '''Invalid''' Method 2 - Attach different known [[weight]]s to the [[Coil Spring|spring]] and [[measure]] the [[width]] of the [[Coil Spring|spring]]. |
− | : Invalid Method 3- Pull the [[Coil Spring|spring]] with the hands and [[measure]] the [[extension]] of the [[Coil Spring|spring]]. | + | : '''Invalid''' Method 3- Pull the [[Coil Spring|spring]] with the hands and [[measure]] the [[extension]] of the [[Coil Spring|spring]]. |
− | : Invalid Method 4 - Attach different known [[weight]]s each to a different [[Coil Spring|spring]] and [[measure]] the [[extension]] of each [[Coil Spring|spring]]. | + | : '''Invalid''' Method 4 - Attach different known [[weight]]s each to a different [[Coil Spring|spring]] and [[measure]] the [[extension]] of each [[Coil Spring|spring]]. |
Revision as of 10:49, 21 March 2019
Contents
Key Stage 4
Meaning
Validity is whether a method produces results which test the hypothesis.
About Validity
- A valid experiment is one which tests the hypothesis posed.
- An invalid experiment would be one which does not test the hypothesis.
- An experiment may be made invalid by not using control variables as they may affect the results instead of the independent variable.
- A conclusion may also be valid or invalid depending on whether the conclusion fits the results that were given.
Examples
Valid Experiment
- Hypothesis - The extension of a spring is directly proportional to the force applied to the spring.
- Valid Method - Attach different known weights to the spring and measure the extension of the spring.
Invalid Experiment
- Hypothesis - The extension of a spring is directly proportional to the force applied to the spring.
- Invalid Method 1 - Attach different known weights to an elastic band and measure the extension of the elastic band.