Intervals

BA501 : The Class : Stats : Intervals
Sampling Distributions and Confidence Intervals

§ Assignments and Activities §

In prior lessons, you have been concerned with the distributions of raw data, x values. In this lesson, the focus will switch the distribution of sample averages, a sampling distribution. If one starts with raw data in a population of x values (e.g. a normal distribution of x values) and obtains a sample from that population, then the average of those x values results in xbar, the sample mean. The best point estimate of the population mean (m) is xbar. A confidence interval gives a range of possible values for m at a given level of confidence.

Objectives:
1. Study textbook and on-line material to gain a general understanding of sampling distributions and confidence intervals.

2. Calculate probabilities associated with xbar (sample average or mean).

3. Calculate confidence intervals base on the point estimate (xbar) of the population mean.

Thought for Today

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class calendar for announcements and assignments.

To complete this Topic successfully, please complete the following activities in the order shown below:

Text TEXTBOOK READING: Read Chapter 7 in Kvanli, et. al.

Optional and free on-line texts for statistics: HyperStat and StatSoft

ON-LINE LESSON 1: Sampling Distributions: Introduction

ON-LINE LESSON 2: Sampling Distributions: Examples

SPREADSHEET: Excel and Equations

ASSIGNMENT: Home Work

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SELF TEST: Practice Quiz

Visit this Web site, click on Tools & Demos then Confidence Intervals.

WEB ACTIVITY: SticiGui

Use WebMail to send attachments and/or messages. Put BA501 (last name) Assignment name and number somewhere in the "subject" line of your e-mail. Address to BA501@mail.cba.nau.edu

WebMail

In addition to the material available at this web site, you may (optional) use WebTutor linked to WebCT. WebTutor is an interactive web site specfically covering the contents of the Kvanli (statistics) textbook assigned in this course. There is a fee for using this web site ($15). Have a credit card ready and click here to signup for this feature. When you have paid for WebTutor, you may click here to logon. You may download a free student guide to WebTutor by clicking here and then selelcting Student Support.

You should now:

Go on to Hypothesis Testing
or
Go back to Statistics

Please reference "BA501 (your last name) Assignment name and number" in the subject line of either below.

E-mail Dr. James V. Pinto at BA501@mail.cba.nau.edu
or call (928) 523-7356. Use WebMail for attachments.