Special Topics Section 7.6. Observational Study An observational study does not try to manipulate the environment (such as by assigning treatments to.

Slides:

Advertisements

Similar presentations

DESIGNING EXPERIMENTS

Advertisements

Part 2 CHAPTER 6.1. DESIGNING AN EXPERIMENT The first goal in designing an experiment is to ensure that it will show us the effect of the explanatory.

Chapter 7: Data for Decisions Lesson Plan

Unit 1 Section 1.3.

The Experimental Method in Psychology Explaining Behaviour

+ Chapter 4 Designing Studies 4.1Samples and Surveys 4.2Experiments 4.3Using Studies Wisely.

Warm-Up Grab a sheet and review!. Section 4.2 Experiments Some of these things are going to look familiar, but remember…we are talking about different.

Introduction to the Design of Experiments

Please review this power point presentation after reading Chapter 1 in the text – you will have quiz questions that pertain to this material.

Chapter 13 Notes Observational Studies and Experimental Design

Section 5.2 Designing Experiments AP Statistics

Warm-up A newspaper article about an opinion poll says that “43% of Americans approve of the president’s overall job performance.” Toward the end of the.

1 Chapter 3: Experimental Design. 2 Effect of Wine Consumption on Heart Disease Death Rate **Each data point represents a different country.

Section 5.2 EXPERIMENTAL DESIGN. EXPERIMENTAL UNITS, SUBJECTS AND TREATMENTS Experimental Unit – The individuals on which the experiment is being conducted.

LT 4.2 Designing Experiments Thanks to James Jaszczak, American Nicaraguan School.

Chapter 7: Data for Decisions Lesson Plan Sampling Bad Sampling Methods Simple Random Samples Cautions About Sample Surveys Experiments Thinking About.

5.2 Designing Experiments

Copyright © 2013, 2009, and 2007, Pearson Education, Inc. Chapter 4 Gathering Data Section 4.3 Good and Poor Ways to Experiment.

Designing Experiments Purpose for experiments – to study the response of one variable to the changes in other variables. Experimental Units (Subjects)

The Practice of Statistics, 5th Edition Starnes, Tabor, Yates, Moore Bedford Freeman Worth Publishers CHAPTER 4 Designing Studies 4.2Experiments.

5.2 Day 1: Designing Experiments. Period 3 – Seating Chart Front Board AlthisarBarnesCreidlerGreenHollowayMcDonaldOliverRoberts EvansCawthorn e AndersonLavendarJeffreysMcKeelMenaSyed.

 Get out your homework and materials for notes!  Take-home quiz due!

Chapter 3.1.  Observational Study: involves passive data collection (observe, record or measure but don’t interfere)  Experiment: ~Involves active data.

Lecture PowerPoint Slides Basic Practice of Statistics 7 th Edition.

AP STATISTICS Section 5.2 Designing Experiments. Objective: To be able to identify and use different experimental design techniques. Experimental Units:

Observational and Experimental Studies.   In an observational study, the researcher merely observes what is happening or what has happened in the past.

C HAPTER 5: P RODUCING D ATA DESIGNING EXPERIMENTS.

Section 5.2 Designing Experiments. Observational Study - Observes individuals and measures variables of interest but DOES NOT attempt to influence the.

Experimental Research

Section 1.3 Introduction to Experimental Design 1.3 / 1.

CHAPTER 9: Producing Data Experiments ESSENTIAL STATISTICS Second Edition David S. Moore, William I. Notz, and Michael A. Fligner Lecture Presentation.

CHAPTER 3- DESIGNING EXPERIMENTS

Warm Up 2/20/2014. Principles of Experimental Design (CRR) 1)Control the effects of lurking variables on the response, most simply by comparing.

Lecture PowerPoint Slides Basic Practice of Statistics 7 th Edition.

Unit 1 Section : Observational and Experimental Studies  Observational Study - the researcher merely observes what is happening or what has happened.

The Practice of Statistics, 5th Edition Starnes, Tabor, Yates, Moore Bedford Freeman Worth Publishers CHAPTER 4 Designing Studies 4.2Experiments.

OBSERVATIONAL STUDIES & EXPERIMENTAL DESIGN AP Statistics – Ch 13.

Copyright © 2014 Pearson Education. All rights reserved LEARNING GOAL Understand the differences between observational studies and experiments;

The Practice of Statistics, 5th Edition Starnes, Tabor, Yates, Moore Bedford Freeman Worth Publishers CHAPTER 4 Designing Studies 4.2Experiments.

Chapter 5.2 Designing experiments. Terminology The individuals on which the experiment is done are the experiment units. When the units are human beings.

The Practice of Statistics, 5th Edition Starnes, Tabor, Yates, Moore Bedford Freeman Worth Publishers CHAPTER 4 Designing Studies 4.2Experiments.

Producing Data: Experiments BPS - 5th Ed. Chapter 9 1.

 Get out homework and discuss with neighbor.  Be prepared with any questions you might have.  Get out materials for notes.

CHAPTER 9: Producing Data Experiments ESSENTIAL STATISTICS Second Edition David S. Moore, William I. Notz, and Michael A. Fligner Lecture Presentation.

1 Chapter 11 Understanding Randomness. 2 Why Random? What is it about chance outcomes being random that makes random selection seem fair? Two things:

CHAPTER 9: Producing Data Experiments ESSENTIAL STATISTICS Second Edition David S. Moore, William I. Notz, and Michael A. Fligner Lecture Presentation.

Section 5.2 Designing Experiments AP Statistics October 27 th, 2014.

Ten things about Experimental Design AP Statistics, Second Semester Review.

OBJECTIVE: TO BE ABLE TO EXPLAIN THE DIFFERENCE BETWEEN AN OBSERVATIONAL AND AN EXPERIMENTAL STUDY 1-5: Observational and Experimental Studies.

CHAPTER 4 Designing Studies

Experiments Why would a double-blind experiment be used?

Design of Experiments.

MATH 2311 Sections 6.2 & 6.3.

Section 5.2 Designing Experiments

Designing Experiments

1.3 Types of Statistical Studies

Warm Up Imagine you want to conduct a survey of all public high school seniors in San Jose to determine how many colleges they plan to apply to this year.

Section 5.2 EXPERIMENTAL DESIGN.

Do Now What percent of Americans wash their hands after using the bathroom? It depends on how collect data. In a telephone survey of 1006 U.S. adults.

Experiments & Observational Studies

MATH 2311 Sections 6.2.

Chapter 3 producing data

Designing Experiments

Experimental Design Statistics.

Experiments Observational Study – observes individuals and measures variables of interest but does not attempt to influence the responses. Experiment.

Homework: pg. 357 #34-36, ) Subjects: the students living in the selected dormitory Factor: the rate structure Treatments: paying one flat rate or.

Experiments Observational Study – observes individuals and measures variables of interest but does not attempt to influence the responses. Experiment.

10/28/ B Experimental Design.

ELEMENTARY STATISTICS, BLUMAN

MATH 2311 Sections 6.2.

Presentation transcript:

Special Topics Section 7.6

Observational Study An observational study does not try to manipulate the environment (such as by assigning treatments to people), but simply observes the measurements of variables of interest that result from people's free choices. This kind of study is generally done when a treatment is unethical (for example, smoking while pregnant) and/or impossible (such as ethnicity) to assign to a person.

Double-Blind Experiment Double-blind experiment: An experiment in which neither the experimental subjects nor the persons who interact with them know which treatment each subject received. When a subject knows what the treatment is, it can add confounding and contaminate the results.

Placebo Effect Placebo effect: The effect of a dummy treatment (such as an inert pill in a medical experiment) on the response of subjects. A subject may respond to any treatment, even a dummy treatment. This is due to the expectation of something good happening as a result of medical intervention, or due to faith in the attending medical practitioner. There is such a thing as “placebo surgery”!

Statistical Significance While the results may show a difference between groups in an experiment, we need to make sure the difference is statistically significant. Definition: An observed effect so large that it would rarely occur by chance is called statistically significant.

Lack of Realism The novelty of an experimental setting might not allow conclusions found in the experiment to generalize to real-world situations. Once the novelty wears off, the effects of a treatment, observed in an experiment, may wear off as well.

Homework Worksheet 7-6.