Question 1

Accuracy is

Accepted Answer

hitting your intended target or mark - getting as close to the value as possible.

Question 2

Precision is

Accepted Answer

the ability to hit the same mark or target each time.

Question 3

Accuracy is measure with

Accepted Answer

measures of central tendency, like mean, median, and mode.

Question 4

Precision is measured with

Accepted Answer

standard deviation, %CV and variance.

Question 5

Quality control data should be both

Accepted Answer

accurate and precise

Question 6

%CV is calculated by

Accepted Answer

SD/Mean times 100.

Question 7

Variance is a measurement of

Accepted Answer

dispersion of data points relative to the mean of the data set.

Question 8

Variance is calculated by

Accepted Answer

SD x SD.

Question 9

To calculate acceptable range of QC, you

Accepted Answer

subtract 2SD from the mean for the lower limit and add 2SD to the mean for the upper limit.

Question 10

If the mean is 10 and the SD is 1, what is the acceptable range of QC?

Accepted Answer

8-12

Question 11

If the SD is 1, what is the variance?

Accepted Answer

1

Question 12

If the variance is 1, is the method precise or imprecise?

Accepted Answer

Precise

Question 13

If the mean is 10 and the SD is 1, what is the %CV?

Accepted Answer

10%

Question 14

If the method has a %CV of 10%, is the overall precision of the method reliable?

Accepted Answer

Yes. 10% or less than is acceptable.

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