- It is often difficult to find the exact mean average of a large population of data. We use confidence Intervals
to estimate where we think the true mean lies. Discuss the advantages of using a confidence interval.
Give an example of a large population of data that is suited to a confidence interval estimate- in other words, it
would be very hard to find the exact true mean of the data. - Estimate Confidence Interval for Population Mean based on sample data and
using Appendix Table for t-Distribution
(population standard deviation is not known, but the sample standard deviation is given).
Keep Confidence Level 90%
For example size n, choose the value for n between 4 and 10
For sample mean – x, choose a value between 10 and 80
For sample standard deviation s, choose a value between 3 and 20 - Use appendix table IV and t-value for your case
- Calculate the margin of error ;
- Create Confidence Interval for Population Mean