2 Statistics Used in Quality Control

Question 1

Give 3 examples of variables/ factors that can affect lab results

Answer 1

1. Temperature
2. Power outage
3. variation in techniques performed by different technologists

Question 2

In a lab, why are control results/ establish range needed?

Answer 2

To detect error in the procedure

Question 3

What is a distribution histogram?

Answer 3

It is a graph that plots values that repeat (x axis) against the frequency/ how often the values occur (y axis)

Question 4

What does statistical QC involve running?

Answer 4

Control materials

Question 5

If a distribution curve is a Gaussian curve, what will be the values for the mean, median and mode?

Answer 5

The mean, median and mode will be equal

Question 6

What creates a non Gaussian distribution/ asymmetrical curve?

Answer 6

If method is not working properly or if there is an error present

Question 7

What information does Measures of Central Tendency provide?
What are the 3 terms use to describe Measures of Central Tendency?

Answer 7

Provides information on accuracy/ nearness to true measurement of the method.

Mean, median and mode

Question 8

What does Measures of Variation related to?

What are the 3 terms use to describe Measures of Variation?

Answer 8

Provides information on precision/ spread of the values.

Range (difference between lowest and highest value), standard deviation and coefficient of variation (is standard deviation expressed as a percentage of mean - up to 1 decimal place)