QMS 102 Lecture Notes - Probability Density Function, Normal Distribution, Confidence Interval

• School: Ryerson University
• Department: Quantitative Methods
• Course: QMS 102
• Professor: Ron Babin

Document Summary

For a normal distribution, the probability density function (pdf) is given by exp{ xf. The probability density function (pdf) is given by exp{ xf. Distribution: ncd which stands for normal cumulative distribution. Xp: incn which stands for inverse normal. , we can use any value < s. , we can use any value > s. Example 1: for the standard normal distribution z~n(0, We obtain z= 1. 645: p(-z< z < z)=0. 95. Objectives: construct and interpret confidence intervals for the population mean. Example 2 market researchers use the number of sentences per advertisement as a measure of readability for magazine advertisements. Find the margin of error for the mean number of sentences in all magazine advertisements using a 95% confidence level. Assume the population standard deviation is about 5. (source: journal of. Solution: for a 95% confidence level, the critical value. So, the margin of error is cze s n.