lecture 3 (part I)

# lecture 3 (part I) - STT 421 Lecture 3(Part I Material...

This preview shows pages 1–5. Sign up to view the full content.

STT 421 Lecture 3 (Part I) Material Covered in This Lecture: * Chapter 1, Section 1.3: Density Curves and Normal Distribution. * Minitab Demonstration 1 1. Density Curve 2 0 Histogram can be used to show the overall pattern of the distribution of a data set. 1 2 A modified histogram: Height of interval = Relative Frequency / Length of Interval 1 2 One way to think of a density curve is as a smooth approximation to the outlines of the modified histogram.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Remark: The histogram of a sample reflects the overall pattern or the distribution of the sample. If the sample size is large enough, the histogram will tell us some information about the distribution of the population from which the sample is taken. 1 2 Median and mean of a density curve Symmetric density curve: Mean = Median;
Skewed to the left: Mean < Median; Skewed to the right: Mean > Median;

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
1 2. Normal Distribution 1 The density curve of a normal distribution is symmetric, unimodal, bell-shaped.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern