Control Variables

Duration: 3 min

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Inside: a video lesson and guided study material.

Module outline

  1. Paper-I | Mathematical Abilities: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Number System, Speed Time and Distance, Arithmetic, Percentage, Average, Simple Interest and Compound Interest, Profit and Loss, Partnership, Time and Work, Algebra, Mensuration and Geometry, Trigonometry, Linear Algebra
  2. Paper-I | Reasoning & General Intelligence: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Selection Decision Table (Decision Making), Logical Sequence Of Words, Crypt Arithmetic, Venn Diagram, Data Arrangement, Inequality, Analogy, Ranking, Order and Sequence, Clerical Aptitude, Verbal Classification
  3. Paper-I | English Language & Comprehension: Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Pronoun, Preposition, Articles, Direct and Indirect Speech, Conjunction, Modals, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Verbal Analogy (Word Based Analogy), Sentence Construction, Active Passive Voice (Voice), Determiner, Facts, Inference and Judgements
  4. Paper-I | General Awareness: Polity, Physics, Biology, Chemistry, Environment, GK- Current Affairs, Static General Knowledge, History, Geography, Indian Economy
  5. Paper-I | Computer Knowledge/Proficiency): Basics of COA, Transport Layer Services, Keyboard Shortcuts, MS Office Applications, MS Office by Yash Sir, Emerging Tech Trends, Society, Law & Ethics, Website, Browser & Services, Internet Fundamentals, Web Design & Development, Introduction to CN, Hardware basics, Network Security, Application Layer, Cyber and Info Security, Cyber Threats and Malware Attacks, Cyber Safety and Security, Role of Internet and Web Services, Security in Mobile and Wireless Computing
  6. Paper-II | Statistics: Statistics, Probability, Research Process Steps
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video is a lecture on experimental design in research, focusing on the definitions and roles of different types of variables. It begins by defining an extraneous variable as any factor other than the independent variable that could influence the study's outcome, potentially leading to inaccurate conclusions. The lecture provides examples such as room temperature and student stress levels affecting exam performance. It then introduces two types of extraneous variables: confounding variables, which are factors researchers forget to control (e.g., sunlight in a plant growth study), and artifacts, which are factors researchers accidentally keep the same (e.g., always using classical music in a heart rate study). The second part of the video defines control variables as factors that researchers deliberately keep constant throughout the study to ensure that any observed changes are due to the independent variable. It uses a plant growth experiment as an example, identifying the amount of fertilizer as the independent variable, plant growth as the dependent variable, and factors like soil type, sunlight, and water as control variables. A table is presented to summarize these concepts, showing how they apply to both the exam performance and plant growth examples.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins with a definition of an extraneous variable, described as any variable other than the independent variable (IV) that could influence a research study. The text on screen states that these variables are not the focus but can interfere with the results. The lecture uses the example of studying the impact of sleep duration on exam performance, where extraneous variables could include room temperature, noise level, or student stress. The video then introduces two types of extraneous variables: confounding variables, which are factors researchers forget to control (e.g., sunlight in a plant growth study), and artifacts, which are factors researchers accidentally keep the same (e.g., always using classical music in a heart rate study). The on-screen text explicitly defines these terms and provides examples, such as 'confounding variables (confounds)' and 'artifacts'.

  2. 2:00 – 3:02 02:00-03:02

    The video transitions to defining control variables, which are factors that researchers deliberately keep constant throughout the study to ensure that any changes observed are due to the independent variable. The on-screen text explains that this is done to isolate the effect of the variable being tested. A plant growth experiment is used as an example, with the amount of fertilizer as the independent variable, plant growth as the dependent variable, and factors like soil type, sunlight, and water as control variables. A table is displayed to summarize the variables for both the exam performance and plant growth examples. The table has four columns: Independent Variable, Intervening Variable, Dependent Variable, and Extraneous Variable. For the exam example, the independent variable is 'Duration of sleep', the intervening variable is 'Alertness during exam', the dependent variable is 'Exam scores', and the extraneous variables are 'Temperature of room, Noise levels, Stress levels'. For the plant example, the independent variable is 'Amount of fertiliser', the intervening variable is 'Growth of plants', the dependent variable is 'Growth of plants', and the extraneous variables are 'Type of soil, Amount of sunlight, Temperature, Water'. The instructor explains that control variables are kept the same for all plants to ensure that differences in growth are due to the fertilizer and not other environmental factors.

The lecture systematically builds an understanding of experimental variables. It starts by identifying extraneous variables as potential sources of error, categorizing them into confounds and artifacts. It then introduces control variables as the method to manage these errors by keeping them constant. The core of the lesson is the distinction between the independent variable (the one the researcher changes), the dependent variable (the one being measured), and the control variables (the ones kept constant). The use of a table to compare two different experiments (exam performance and plant growth) effectively demonstrates how these concepts apply in practice, reinforcing the idea that a well-designed experiment isolates the effect of the independent variable by controlling for all other factors.

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