MATH 1P98 Chapter 7: Chapter 7.docx

• School: Brock University
• Department: Mathematics and Statistics
• Course: MATH 1P98
• Professor: Lorna Deeth

Document Summary

Z score = critical values: under certain conditions, the sampling distribution of sample proportions can be approximated by a normal distribution, a z score associated with a sample proportion has a probability of a/2 of falling in the right rail, the z score separating the right tail region is commonly denote by za/2 and is referred to as a critical value because it is on the borderline separating z scores from a sample proportions that are likely to occur from those that are unlikely. Procedure: verify that the requirements in the following box are satisfied, use excel or z scores to find the critical value za/2 that corresponds to the desired confidence level, evaluate the margin of error, use the value of the calculated margin of error e and the value of the sample proportion p find the values of the confidence interval limits p e and p+e.