Some Terms. Part - 4: Project Quality Control
Total Quality Management:
Everyone in the company is responsible for the quality and can influence the quality of the outcome
ISO 9000: Ensures that companies document what they do and do what they document
Statistical Independence: Two samples are not dependent on each other
Mutually Exclusive: One choice excludes the other
Standard Deviation: Calculate the mean. Then find difference between each data point and the mean. Square each of the differences.std dev = SQRT((sum of the squired differences)/(count data points - 1)). The higher your standard deviation the more diverse the data points.
Six Sigma: six sigma standard deviations (99.99966% of the data points) meet customer's quality limits.
Prevention vs inspection:
Attribute sampling: conforms quality or not. binary
variable sampling: How well something conforms to quality
Special causes: Unusual and preventable
Tolerance: quality limits for product acceptance Control Limits: Three standard deviation above and below the mean.