Purchase Solution

Explanation of odds ratio in a study of smoking.

Not what you're looking for?

Ask Custom Question

Those who have quit smoking often return to the habit. The authors of a paper concluded that forbidding smoking in the smoker's residence was a significant predictor of the ability to abstain from smoking. They collected data, calculated statistics, and presented the following as support for their conclusion:

C.I. : (1.05, 3.6)
P < 0.01

Based on these statistics, describe how the authors reached their decision. Is the conclusion they reached statistically significant? If the data had shown p<0.05 rather than p<0.01, would this have been stronger or weaker support for their conclusion?

Purchase this Solution

Solution Summary

This solution briefly explains how to interpret the odds ratio in a study of cigarette smoking. It defines the odds ratio, interprets a confidence interval for the odds ratio, and explains the significance level of the test and the p-value.

Solution Preview

Odds can be defined as the probability of an event not happening divided by the probability of the event happening. If the probability of an event happening is p then the odds associated with the event are:

Odds = (1-p) / p

In this study, samples were taken from the two groups and estimates of the odds were calculated on each of them.

Odds _1 = (proportion not returning to smoking) / (proportion returning to smoking) within the group where smoking is prohibited in the residence.

Odds _2 = (proportion not returning to smoking)/(proportion returning to smoking) within the group where smoking is allowed in the residence.

The test statistic in this study, sometimes called the "odds ratio" or "OR", is the ratio of the odds ...

Purchase this Solution

Free BrainMass Quizzes
Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.