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According to the article "Rubbing Hands Together Under Warm Air Dryers Can Counteract Bacteria Reduction" (Infectious Disease News, September 22,2010 ), washing your hands isn't enough-good "hand hygiene" also includes drying hands thoroughly. The article described an experiment to compare bacteria reduction for three different hand-drying methods. In this experiment, subjects handled uncooked chicken for 45 seconds, then washed their hands with a single squirt of soap for 60 seconds, and then used one of the three hand-drying methods. The bacteria count on their hands was then measured. Suppose you want to carry out a similar experiment with 30 subjects who are willing to participate. Describe the steps in a process you might use to randomly assign each of the 30 subjects to one of the hand-drying methods.

Step by step solution

01

Preparation of Three Hand-Drying Methods

The first step is to prepare the hand-drying method for each group. You can label the hand-drying methods as A, B and C.

02

Assign Numbers to the Subjects

Assign a unique number to each of the 30 subjects participating in the experiment, such as 1 to 30.

03

Use Random Number Generation to Assign Subjects

Utilize a random number generator, such as a random number table or computer software, to generate 30 random numbers between 1 and 30 without duplicates. This ensures that each subject has an equal chance to be assigned to any of the three hand-drying methods.

04

Divide the Generated Numbers into Three Groups

Divide the generated random numbers into three equal groups of 10 subjects each. For example, the first 10 random numbers will be assigned to Group 1, the next 10 random numbers to Group 2, and the last 10 random numbers to Group 3.

05

Assign Hand-Drying Methods to the Groups

Assign one of the hand-drying methods (A, B, or C) to each group. For instance, Group 1 subjects will use Method A, Group 2 subjects will use Method B, and Group 3 subjects will use Method C.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Random Assignment

Random assignment is a key component in experimental design, particularly in studies that seek to understand cause and effect relationships. In the described experiment of evaluating hand-drying methods, random assignment was used to ensure unbiased results. By randomly assigning each of the 30 subjects to one of three hand-drying methods, each method gets an equal number of participants, avoiding any systematic bias.

Random assignment helps in distributing potential confounding variables evenly across groups. For instance:

• Differences in skin type or hand washing technique among subjects.
• Variability in bacteria transfer from handling raw chicken.

In practice, random assignment involves generating 30 random numbers, correlating each number with a subject. This ensures that all subjects have an equal probability of being assigned to any of the three methods, leading to fair and reliable outcome comparisons.

Hand Hygiene

Good hand hygiene is not just about washing hands thoroughly. It also involves effective drying to prevent bacteria transfer. The article suggests that simply rubbing hands under warm air dryers might not suffice in counteracting bacteria. Proper hand hygiene includes complete removal of germs post-washing.

Why is hand drying important?

• Wet hands can increase the transfer of bacteria. Drying reduces this risk.
• Moisture left on hands can potentially create a better environment for bacteria to thrive.

Each method, whether paper towels, air dryers, or cloth towels, has its own efficacy in bacteria reduction. Understanding these differences helps in choosing the most hygienic option.

Bacteria Reduction

Bacteria reduction refers to decreasing the number of microorganisms on the skin surface. The effectiveness of each hand-drying method on bacteria reduction was tested in this experiment. After all, the primary goal of hand hygiene is to eliminate harmful pathogens.

Factors influencing bacteria reduction:

• The duration spent drying hands—longer typically results in more effective bacteria removal.
• The specific technique used, since varying methodologies can lead to different outcomes.

In scientific studies, measuring bacteria count before and after drying helps determine which method performs best. Such experiments are vital in public health, promoting practices that minimize infection transfer and enhance overall hygiene.