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28 Cards in this Set
- Front
- Back
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exampls of qualitative data |
audibility of a sound pattern of veins in a butterflys wing shape of a mineral crystal shape of a crystal |
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examples of quantitative data |
water temperature aircraft speed time of an accident |
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Qualitative data |
uses precise word descriptions |
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Quantitative data |
is reported using numerical measurements easier to interpret |
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measured data |
has two parts- a number and a unit accomplishes three things- it signals that the preceding number is a measurement, it indicates the kind of dimension, and it identifies the size of the dimensional unit |
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metric system |
units are based on the power of 10 French metric system- meter for measuring length, kilogram for measuring the quantity of matter |
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base units |
French SI- began with 2 base units now have 7 it is one defined by a set of measurable conditions that can be recreated in any properly equipped laboratory. SI Units- meter-length kilogram-mass second-time ampere-electric current kelvin-absolute temperature mole-amount of substance candela-radiant intensity |
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SI Units |
SI Units-
meter-length kilogram-mass second-time ampere-electric current kelvin-absolute temperature mole-amount of substance candela-radiant intensity Derived Units- liter-unit of volume newton-unit of force joule-unit of energy and work Derived Units- are combinations of base units |
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unit prefix |
you can know the size of a metric unit |
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Metric Conversions |
use conversion factor to convert conversion factor- is any factor that multiplies a measurement to convert its unit to a different but equivalent unit |
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Conversion Factor Properties |
It is a fraction Its overall value is equal to 1, since same sized quantities are in both the numerator and the denominator The value in the numerator has the unit you are converting to; the value in the denominator has the unit you are converting from After multiplying the original measurement with the factor and cancelling like units, the result is the same quantity but is a new number with the desired unit |
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Accuracy |
an assessment of the measurement error |
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Precision |
an assessment of the exactness of a measurement |
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Repeatability |
Scientist evaluate the usefulness of their measurements by repeating them as many times as needed to see how they vary. Repeatability is considered good when their random errors are small. |
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Significant digits |
its a concept to indicate the precision of measurements |
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Significant Digits |
All zero between nonzero digits are significant 10.06- 4 SDs Decimal points define significant zeros 8.500- 4 SDs If a decimal point is not present no trailing zeros are significant 120- 2 SDs If a decimal point is present, none of the zeros to the left of the first nonzero digit are significant 0.050- 2 SDs |
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Scientific Notation |
used to express very large or small numbers in a more convenient |
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Scientific Notation |
3800= 3.80 times 10 to the 3rd power |
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Weight |
can indicate the amount of matter in an object but it does not measure the amount of matter directly |
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Spring Scale |
an instrument that measures weight |
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electronic scale |
another instrument that is used to weigh things |
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Mass |
the measure of the amount of matter in an object |
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Volume |
the amount of space matter occupies |
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volume for cube |
V=e cubed |
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volume for rectangle |
V= lwh |
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volume for cylinder |
V= 3.14(r squared)(h) |
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displacement method |
ex in class |
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Density |
a property of matter used to identify the amount of matter it contains compared to its volume |
