An Introduction to Statistical Methods and Data Analysis
An Introduction to Statistical Methods and Data Analysis
7th Edition
ISBN: 9781305269477
Author: R. Lyman Ott, Micheal T. Longnecker
Publisher: Cengage Learning
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A clinical researcher would like to know whether a certain drug is more effective at treating lepression than just psychotherapy alone. In order to study this topic, the researcher gains access to a population of individuals diagnosed with depression and administers surveys to a random subset of that population. To assess the relationship between therapy type and depression symptoms, the survey asks participants what their current treatment plan involves (drug therapy, psychotherapy, both drug and psychotherapy, or no therapy) and what their current depression symptoms include. This study is a(n): observational study randomized comparative experiment stratified random sample block design
A research article describes a study that investigated the relationship between depression and chocolate consumption. Participants in the study were 931 adults who were not currently taking medication for depression. These participants were screened for depression using a widely used screening test. The participants were then divided into two samples based on their test score. One sample consisted of people who screened positive for depression, and the other sample consisted of people who did not screen positive for depression. Each of the study participants also completed a food frequency survey. The researchers believed that the two samples were representative of the two populations of interest—adults who would screen positive for depression and adults who would not screen positive. The paper reported that the mean number of servings per month of chocolate for the sample of people that screened positive for depression was 8.37, and the sample standard deviation was 14.85. For the…
Biofeedback is a treatment technique in which people are trained to improve their health by using signals from their own bodies. Specialists in many different fields use biofeedback to help their patients cope with pain. A study was conducted to compare a biofeedback treatment for chronic pain with an NSAID medical treatment. A group of 2,000 newly diagnosed chronic pain patients were randomly assigned to receive to one of the two treatments. After 6 weeks of treatments, the pain levels of the patients were assessed with the following results: (a) Compute the relative risk of pain reduction for the two treatments and give an interpretation of your answer. (b) Computetheoddsratioofpainreductionforthetwotreatmentsandgiveaninterpretationofyour answer. (c) Are the relative risk in part (a) and odds ratio in part (b) close? Why?
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