Data Modeling and Spreadsheets Concepts
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Questions and Answers

Which of the following is NOT a type of data check?

  • Color check (correct)
  • Type check
  • Length check
  • Presence check

    • A format check ensures that a data item has the correct number of characters.

    False

    What is the main function of an operating system?

    To manage hardware and software, providing an interface for users.

    The _____ program scans for and removes harmful software from the computer.

    <p>Antivirus</p> Signup and view all the answers

    Match the operating systems with their respective companies:

    <p>macOS = Apple Windows = Microsoft Android OS = Google Ubuntu = Canonical</p> Signup and view all the answers

    Which function of an operating system allows multiple programs to run at the same time?

    <p>Multitasking</p> Signup and view all the answers

    Utility programs are unnecessary for maintaining a computer's performance.

    <p>False</p> Signup and view all the answers

    Name one type of utility program.

    <p>Disk Management tool</p> Signup and view all the answers

    What is the main purpose of software updates?

    <p>To keep programs up to date for better security and performance</p> Signup and view all the answers

    ASCII is an 8-bit binary code that represents all the characters on a keyboard.

    <p>False</p> Signup and view all the answers

    What are the two main types of compression?

    <p>Lossy and Lossless</p> Signup and view all the answers

    A _______ is a single bit of data, either a 0 or a 1.

    <p>bit</p> Signup and view all the answers

    Match the following compression types with their characteristics:

    <p>Lossy = Reduces file size by permanently removing some original data Lossless = Reduces file size without losing any original data</p> Signup and view all the answers

    What does the AND gate output when all its inputs are 0?

    <p>0</p> Signup and view all the answers

    The Least Significant Bit (LSB) is the digit with the highest place value in a binary number.

    <p>False</p> Signup and view all the answers

    What is the function of logic gates in computers?

    <p>To transform the 1s and 0s from input wires based on their state.</p> Signup and view all the answers

    What is one primary function of a delivery drone's AI?

    <p>To analyze data for optimal flight paths</p> Signup and view all the answers

    Pseudocode can be arranged in any order when writing algorithms.

    <p>False</p> Signup and view all the answers

    What does it mean to decompose a problem?

    <p>Break down a problem into smaller parts.</p> Signup and view all the answers

    An algorithm provides a set of _____ to solve a particular problem.

    <p>instructions</p> Signup and view all the answers

    Match the terms with their definitions:

    <p>Algorithm = A method of solving problems using a sequence of steps Conditional statement = A programming decision-maker that executes actions based on conditions Pseudocode = A simple way of representing algorithms without strict syntax Decomposing = Breaking a large problem into smaller, more manageable sub-problems</p> Signup and view all the answers

    Which of the following is NOT a reason to break a complex problem into smaller parts?

    <p>It complicates the learning process</p> Signup and view all the answers

    Delivery drones can operate autonomously without any human control.

    <p>True</p> Signup and view all the answers

    Give an example of a possible sub-problem when creating a program to manage a library’s books.

    <p>Add Books, Search Books, Check Out Books, Return Books, Track Due Dates</p> Signup and view all the answers

    Study Notes

    8MD.01: Key Features of Models

    • A model is a digital representation of a real-life scenario, breaking it down into attributes (data items).
    • A simulator is an interactive model.

    Key Features of Models

    • Accuracy
    • Speed
    • Cost
    • Scalability (how easily it can be scaled up)

    8MD.03: Spreadsheets for Modeling and What-If Analysis

    • Spreadsheets organize data in rows and columns, allowing calculations.
    • Cell references identify specific cells or ranges.
    • "What-if analysis" investigates a scenario by changing data to see how it affects the model.

    Data and Databases

    • Data is raw facts and figures.
    • Databases organize data for storage, processing, and access.
    • A primary key uniquely identifies each record in a table.
    • Data should be accurate, relevant, and sufficient for a given purpose.

    Data Capture Forms and Data Validation

    • A data capture form is a document to collect specific data for a purpose.
    • Data validation is an automatic check reducing errors.
    • Input masks control the data input format. (e.g., toggle buttons, drop-down menus, radio buttons, checkboxes).
    • Data must pass type, length, presence, format, and range checks to ensure quality.

    8CS.01: Operating Systems

    • Software are instructions for the computer.
    • Hardware are physical parts of a computer (e.g., keyboard, printer, mouse).
    • An operating system (OS) manages hardware and software for the user.
    • Basic OS functions include program start, file management, memory management, user management, and multitasking and interface.

    8CS.02: Utility Programs

    • Utility programs maintain digital devices.
    • Examples include antivirus, file management, disk management, compression, and backup utilities.
    • Utility programs optimize computer performance by, for example, virus scanning/removal, file-backup, compression, defragmentation, performance monitoring, firewall, and software updates.

    8CS.03: ASCII

    • ASCII (American Standard Code for Information Interchange) is a 7-bit binary code for keyboard characters.
    • It represents characters by electrical pulses (high/low signal).

    8CS.04: Compression

    • Compression shrinks file sizes by removing data from files by removing unnecessary metadata, or permanently removing some of the original data.

    8CS.05: Binary to Denary Conversion

    • The denary system uses digits 0 to 9.
    • The binary system uses 0 and 1.
    • A bit is a single binary digit (0 or 1).
    • MSB is the most significant bit (leftmost bit in binary representation)
    • LSB is the least significant bit (rightmost bit in binary representation)

    8CS.06: Logic Gates

    • Logic gates are used in computers to transform binary inputs into binary outputs.
    • The key logic gates include AND, OR, and NOT gates, which can be represented using truth tables.

    8CS.07: Primary Memory (RAM and ROM)

    • Primary memory stores programs and data currently in use.
    • RAM (Random Access Memory) is volatile, meaning data is lost when the power is off.
    • ROM (Read-Only Memory) is non-volatile, retaining data even when the device is turned off; it often stores boot up programs.

    8CS.08: Machine Learning

    • Machine learning is a subset of artificial intelligence (AI).
    • AI involves creating systems that perform tasks that normally require human intelligence.
    • Machine learning specifically involves systems that improve their performance by learning from data.

    8CS.09: Augmented Reality (AR)

    • Augmented Reality (AR) overlays digital imagery onto the real world.

    8CS.10: Autonomous Programming & AI in Robotics

    • Autonomous programming uses hardware and AI to complete tasks.
    • Sensors gather data from the surrounding environment (e.g., cameras, microphones).
    • Robots make decisions using AI, based on input from sensors, and then complete tasks.

    8CT.08: Decomposing Problems into Sub-Problems

    • Decomposing a problem means breaking it into smaller, simpler parts.
    • This makes complex problems easier to solve and less prone to errors.
    • Solving the sub-problems individually leads to a more efficient workflow.

    8CT.03: Characteristics of Pseudocode

    • Pseudocode uses plain, understandable language, making it easier to read for those not very familiar with particular coding languages.
    • Pseudocode is not executed by a computer, but is structured like a program for human use.
    • Pseudocode should be read top to bottom.
    • Searching algorithms find specific items or values within datasets.
    • Linear search involves comparing each element in the dataset one-by-one to find the target.

    8P.11: Interacting between two devices

    • Radio is a wireless communication device.
    • Code examples demonstrating methods to send and receive messages using radio functionality.

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    EOT1 Computing Revision Stage 8 PDF

    Description

    This quiz covers key features of models, including their accuracy, speed, and cost efficiency, as well as the use of spreadsheets for modeling and what-if analysis. Understand how databases organize data, and learn about data capture forms and validation techniques essential for error reduction.

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