Example: Lactose Intolerance Section
In a sample of 100 African American adults, 70 were identified as having some level of lactose intolerance. Compute a 95% confidence interval to estimate the proportion of all African American adults who have some level of lactose intolerance.
To create a 95% confidence interval of dog ownership using the normal approximation method in Minitab:
- In this case we have summarized data so select Summarized data in the dropdown.
- For number of events, add 70 and for number of trials add 100.
- Select Options
- The default Confidence level is 95.
- Change the Method to Normal approximation because the assumption of \(n \widehat p \geq 10\) and \(n(1- \widehat p) \geq 10\) has been met
- Click OK and OK.
This should result in the following output:
p: event proportion
Normal approximation is used for this analysis.
|N||Event||Sample p||95% CI for p|