Title: Confidence Intervals | What you need to know for your Six Sigma exam.
Headings: Confidence Intervals
Confidence Intervals
Confidence Interval vs Confidence Level
Confidence Interval vs Prediction Interval
Estimating Population Mean and Standard Deviation
Margin of Error
Z Scores
Common confidence intervals and corresponding Z scores
Confidence Interval Question Using Z-Score
Confidence Interval Question Using T-Score
Calculating the Confidence Interval Comparing Two Population Means
Example
Additional Confidence Intervals Videos
Confidence intervals for Variation
Confidence intervals for Proportion
What are the Difference Between Control Limits and Confidence Intervals?
Confidence Interval
Also See:
Other Confidence Intervals Problems
ASQ Six Sigma Black Belt Exam Confidence Intervals Questions
Authors

Content: Confidence Intervals | What you need to know for your Six Sigma exam. Confidence Intervals
When we use a sample group to gain insight into an entire population – whether we’re talking people or a product built in a factory – we risk the sample group not completely reflecting the whole population. Therefore, we need confidence intervals. Further, we use confidence intervals to calculate a degree of certainty that the sample group accurately represents the entire population from which they were drawn. Another way of thinking of it is that if you drew the same sized sample group hundreds of times and performed the same measurements, a certain percentage of confidence intervals in those sample groups will contain the population mean. A confidence interval is a range of values. So, you can have a percentage of certainty that the mean of the population lies within that range in any given sample from that population. YouTube
Confidence Interval vs Confidence Level
A confidence interval is a range of values that probably contain the population mean. However, a confidence level is a percentage of certainty that in any given sample, that confidence interval will contain the population mean. Confidence Interval vs Prediction Interval
Prediction intervals are used to calculate the next probable data point.