2. Introduction


Independent Variable(s) : Brand of antibacterial agent used
Dependent Variable(s) : The percentage of bacteria killed
Constant Variable(s): The volume of antibacterial agent used, type of agar, volume of agar, type of broth, amount of bacteria spread intially in each petri dish, type of petri dish, environment petri dish is left in (such as the surrounding temperature, amount of moisture, etc.)

“If Dettol is used, it can kill more bacteria than the rest of the agents.” 
In other words, we believe Dettol is the best product out of the few antibacterial agents we have chosen for this experiment.

Background Research:
Since Dettol has been around for 80 years, Dettol is commonly known as the family brand when mentioned. According to the Dettol webpage, they claim that Dettol is reliable and effective, and thus, it has gained a positive reputation over the years. 
(Over 80 years, n.d.)

Also, as advertised on advertisements, it is said to be scientifically proven that Dettol can remove up to 99.9% of germs and bacteria.  
(T Entertainment, 2013)

In this article, it is shown in the charts that Dettol is ranked 3rd Position for the most trusted brand in India.
(Trust is a scarce and fragile resource in the world of marketing, 2014)

(Our brands., n.d)
(Grocery News, n.d.)

From the above article, Dettol is said to be proven to combat germs, and kill germs such as Methicillin-resistant Staphylococcus aureus, Flu Virus, Escherichia coli and Salmonella.
We would like our experiment to compare the more popular and well-known brands of possessing antibacterial effects. Thus, the rationale behind the choosing of the brands is that we want to make sure there is a certain reputation for these brands and conduct our experiment to show which agent actually lives up to their advertising and their branding.

Other Brands that we are going to use
Lifebuoy: As advertised, LifeBuoy is said to be scientifically proven to kill 99.9% of germs in 10 seconds.  
(Lifebuoy, n.d.)

Mama Lemon: Mama Lemon has also been proven to be Singapore’s No. 1 Selling Dishwashing Liquid. It’s webpage also advertises that it can get rid of 99.9% of bacteria.
(Mamalemon, n.d)

Clorox Bleach: As advertised on the webpage, Clorox is proven to remove 99.9% of germs.
(All Purpose Cleaner, n.d.)


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