Course Outline

Chapter 4 Review Questions: 7. Sampling types: a. simple random sampling: Every item in the population has an equal probability of being selected ( can be use to conduct a sample from a group that has the same characteristic like group of diabetic or group of computer engineers) b. Stratified sampling: The population is partitioned into groups, or strata, and a sample is selected from each stratum ( can be use to conduct a sample from an organization like in a company: there is managers, supervisors, staff) th th c. Systematic sampling: Every nth (4 , 5 etc.) item is selected ( can be use to conduct a sample from a group that has the same characteristic like group of diabetic or group of computer engineers) d. Cluster sampling: A typical group is selected, and a random sample is taken from within the group ( can be use to conduct a sample from a group within specific quality like group of patients who has diabetic type 2) e. Judgment sampling: Expert opinion is used to determine the location and characteristics of a definable sample group ????

Such as doing a study on types of diseases that a hospital is usually receive in this case we may need a doctor opinion for the sample selection criteria.

11. ! Accuracy: the closnet of agrreement between different observed value and an accepted reference value ! Precision : hitting the same target every time but not necessary to be the perfect one ! reproducibility: 13. - Process capability: - can be improved: 14. - Process capability indexes: - Cp: - Cpl: - Cpu: - ??? process capability indexes will The

or standard.

Accuracy may close to the real value but precision may not. in precision different readings are close together but While reproducibility is the capability of the device to produce the same readings while different operators using

help us to improve the operating area by investigating the variance that we have and try and it will help in selecting the best supplier that have the lowest variations....