experiment 1: statical analysis Flashcards
the measurement of the samples must provide useful data, where their _____ and _____ are evaluated
accuracy and precision
what are the statical parameters commonly used in data treatment
measures of control tendency
measures of accuracy
measures of precision
this provides measures of the uncertainty associated with the central results
measures of central tendency
in measures of central tendency, chemist uses ___ to ___ replicates of measurements the central is called…
2 to 5best or representative
it is the average of the data. it is calculated by adding up the data and dividing the sum to the number of measurements made.
mean
the middle results when the set of data is arranged in increasing order
median
this provides a measures of the uncertainty associated with the central value obtained
measures of precision
it is defined as the closeness of the results obtained which were measured in exactly the same way
precision
it is the difference between the highest and lowest value in a set of measurement. it is used for small no. of measurements
range
range expressed in relative terms. the range is divided to the mean and multiplied by 1000
relative range
this is the average of the individual deviations from the mean, divided by the mean
average deviation
it is used for obtaining scatter due to random error
variance
it is the square root of variance
standard deviation
it is the relative value of standard deviation
coefficient of variation
it is another relative value of standard deviation multiplied by 1000
relative standard deviation
this provides the measures on the closeness to the true value and is expressed as error
measure of accuracy
it is the difference between the measure value and the true value
absolute error
the absolute error is divided by the true error and then multiply by 100 or 1000
relative error
the confidence interval provides us the range where the true value lies
confidence limit
this test is used when there is a questionable data . it determines whether the data may or may not be rejected
Q-test
what is one way to minimize systematic errors in an experiment, especially if the experiment requires high accuracy
calibration
what is the instrument used in this experiment
analytical balance
what is the title of this experiment
statistical analysis
