Use this estimate if you have a sample of numeric data for which you want an estimate of and confidence interval for the mean.
1. Create a new estimate by dragging one from the shelf or choosing Object | New | Interval Estimate.
2. From the pop-up menu in the estimate's upper-right corner, choose Estimate Mean.
3. Drop the attribute of interest into the prompt in the top section of the estimate, where it says Attribute (numeric): <unassigned>.
Fathom uses the attribute's name and values to fill in the estimate at the default confidence level of 95%.
· Change the confidence level by double-clicking the 95
, typing a new value, and pressing Return.
Key Curriculum Press/Key College Publishing www.keypress.com/fathom |