Symbiosis, Lab Experiments in Microbiology
Symbiosis, Lab Experiments in Microbiology
12th Edition
ISBN: 9781256549567
Author: Johnson
Publisher: Pearson Custom Publishing
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Chapter 47, Problem 2Q
Summary Introduction

To determine:

The reason for the necessity of both sucrose and bacteria for tooth decay.

Introduction:

Tooth decay is nothing but the damage of teeth due to acid production by bacteria. It is otherwise referred to as cavities or dental caries. Severe pain while ingestion of food and other times are some symptoms. The color of these caries ranges from yellow to black.

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Q8. A researcher wants to study the effectiveness of a pill intended to reduce stomach heartburn in pregnant women. The researcher chooses randomly 400 women to participate in this experiment for 9 months of their pregnancy period. They all need to have the same diet. The researcher designs two groups of 200 participants: One group take the real medication intended to reduce heartburn, while the other group take placebo medication. In this study what are: Independent variable: Dependent variable: Control variable: Experimental group: " Control group: If the participants do not know who is consuming the real pills and who is consuming the sugar pills. This study is It happens that 40% of the participants do not find the treatment helpful and drop out after 6 months. The researcher throws out the data from subjects that drop out. What type of bias is there in this study? If the company who makes the medication funds this research, what type of bias might exist in this research work?
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