lecture 13

# lecture 13 - Lecture 13 Material Covered in This Lecture...

This preview shows pages 1–3. Sign up to view the full content.

Lecture 13 Material Covered in This Lecture: 1 Chapter 6, Section 6.2: Tests of Significance 1 2. Tests of Significance Goal: Assess the evidence based on the data in favor of a claim about the population. (1). The reasoning of significant tests A significance test is a formal procedure for comparing observed data with a hypothesis whose truth we want to assess . The hypothesis is a statement about the parameters in a population or model. The results of a test are expressed in terms of a PROBABILITY that measures how well the data and the hypothesis agree Example (Example 6.14): Do middle aged male executives have different average blood pressure than the general population? The national center for health statistics reports that the mean systolic blood pressure for males 35 to 44 years of age is 128 and the standard deviation in this population is 15. The medical director of a company looks at the medical records of 72 company executives in this age group and finds that the mean systolic blood pressure in this sample is X = 126.07. Is this evidence that executive blood pressures differ from the national average? Example 6.7 (p. 400): One purpose of the National Student Loan Survey described in Example 6.3 is to compare the debt of different subgroups of students. For example, the 525 borrowers who last attended a private four-year college had a mean debt of \$21200, while those who last attended a public four-year college had a mean debt of \$17100. The difference of \$4100 is fairly large, but we know that

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

View Full Document
these numbers are estimates of the true means. If we took a different
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