Activity 2: Identifying variables Directions: Identify the Independent, Dependent and Extraneous variable/s in each of the following situations. 1. Three groups of students were placed in a classroom with controlled room temperatures of 18.C, 20C, 25C. The math exam scores of the students were then taken and compared to the other groups. Independent variable: Dependent variable: Extraneous variable: 2. An online seller would like to know whether the indication of price on Facebook posts will attract consumers more. He posted 50 products for sale on Facebook market, 25 of which he indicated the price while the remaining 25 products, did not have prices. Buyers were just instructed to send him a personal message (pm) if they want to know the price. He then identified which products have greater sales. Independent variable: Dependent variable: Extraneous variable: 3. A housewife wanted to know which soil is best for her pechay plants: the soil purchased from an online seller, soil from her backyard compost or the soil underneath the nearby bamboo tree. She planted 30 pechay seeds into each soil source and then compared the growth of pechay after a month. Independent variable: Dependent variable: Extraneous variable: 4. Jenny is only borrowing the cellphone chargers of her brother, sister and mother because she lost her phone charger. All chargers are of the same specifications as hers even though they have different phone brands. However, she would like to know which charger and charging cable combination would fill her phone battery the fastest. She used the following codes as her reference and charged her phone uninterrupted using the following combination. The charging time of the phone was then compared. Brother's Charger: BB Sister's Charger: SS Mother's Charger: MM Brother's Cable: bb Sister's Cable: ss Mother's Cable: mm Combination Charging Combination Charging Combination Charging time time time BBbb SSss MMmm BBSS SSbb MMbb BBmm SSmm MMss Independent variable: Dependent variable: Extraneous variable: 5. A teacher wanted to know which learning delivery modes (pure online, pure modular, combination of online and modular) is most effective and has the fastest turnaround time in the submission of accomplished activities among her Grade 12 students. She divided the students into 3 groups, gave them the same activity sheets and asked them to submit as soon as it is completed. She then compared the scores and completion time of the 3 groups. Independent variable: Dependent variable: Extraneous variable:

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