- Slides 1-6
- Introduction
- Effect of Sample Size on Hypothesis Testing

- Slides 7 – 11
- Statistical Significance vs. Practical Importance

- Slides 12 – 17
- Using Confidence Intervals to Conduct Hypothesis Tests

- Slides 18 – 21
- What Confidence Intervals ADD to our analyses
- Summary

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]]>- Slides 1-7: Finding P-Values

**There is an error in the transcript for SLIDE 13: It says****“We can enter 2.5 in for “x” and select P(X > x) from the list to calculate a probability of 0.01044.”**

**It should read****“We can enter 2.31 in for “x” and select P(X > x) from the list to calculate a probability of 0.01044.”**

- Examples and Summary

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]]>- Slides 1-10: Introduction and Test Statistics

- Slides 11-16: Check Conditions

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]]>- Slides 1-11: Type I and Type II Error

- Slides 12-13: More about Errors

- Power of a Statistical Test

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]]>- Slides 1-4: Introduction to Steps and Motivating Examples

- Slides 5-12: Steps for Motivating Examples

- Slides 13-18: Final Comments

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]]>To test the first figure, let p be the proportion of email users who feel that spam has increased in their personal email. The first set of hypotheses that the student wants to test is then:

Ho: p = 0.37

Ha: p ≠ 0.37

Based upon the data collected by this student, a 95% confidence interval for p was found to be:

(0.25, 0.32).

Based on the collected data, a 95% confidence interval for p was found to be (0.08, 0.14).

For testing the second figure in the report, let p be the proportion of email users who feel that spam has increased in their work email. The second set of hypotheses that the students wants to test, is then:

Ho: p = 0.29

Ha: p ≠ 0.29

Based upon the data collected by this student, a 95% confidence interval for p was found to be:

(0.273, 0.304).

According to a study completed in 2006 by Pew Internet, 42% of all Americans had a broadband Internet connection at home. This same statistics student wanted to see if this percentage is different for students at his university.

Ho: p = 0.42

Ha: p ≠ 0.42

Based upon the data the student collected, a 95% confidence interval for p was found to be:

(0.439, 0.457).

According to the same Pew Internet study, 8% of those with broadband connections are using fixed wireless. let p be the proportion of broadband users who use fixed wireless, and consider the hypotheses:

Ho: p = 0.08

Ha: p ≠ 0.08

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]]>Ho: p = 0.087

Ha: p ≠ 0.087

Based on the collected data, a 95% confidence interval for p was found to be (0.08, 0.14).

The UCLA Internet Report (February 2003) estimated that roughly 60.5% of U.S. adults use the Internet at work for personal use. A follow-up study was conducted in order to explore whether that figure has changed since. Let p be the proportion of U.S. adults who use the Internet at work for personal use.

Ho: p = 0.605

Ha: p ≠ 0.605

Based on the collected data, the p-value of the test was found to be 0.001.

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