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If a measurement is smaller does the percentage error increase or decrease?
increase
What is the difference in temperature variation from -28 degrees F to 19 degrees F?
47 oF From -28 oF to 0 oF is an increase of 28 oF; from 0 oF to 19 oF is an increase of 19 oF; so an increase from -28 oF to 19 oF is (increase from -28 oF to 0 oF) + (increase from 0 oF to 19 oF) = 28 oF + 19 oF = 47 oF Or mathematically: 19 oF - (-28 oF) = 19 oF + 28 oF = 47 oF * * * * * NO! The Fahrenheit scale is not an absolute scale so the measurement unit for the difference is Fahrenheit degrees, not degrees Fahrenheit. May seem trivial, but mathematics demand precision.
What is percent of change in 240 of 320?
It's difficult to tell which way that one's going. 240 to 320 is a 33 and 1/3% increase. 320 to 240 is a 25% decrease.
Why are several trials taken for each measurement in an experiment?
A good way to reduce error or increase measurement accuracy is to take several measurements and compute their average. In other words, you achieve accuracy through averaging. (This also validates the repeatability of the measurement.)
What was the approximate percent increase of Tameka's plant if the plant measured 3 inches at the beginning of the week and 5 inches at the end of the week?
It increased by 66.66... (repeating) %.
