Unit 1 Revision

Unit 1 Revision

1. Data and data quality

   • Data
     • Data is words, numbers, images etc. without context
   • Information
     • Information is a series of numbers, words, images etc. that has been out into context.
   • Processing
     • When raw data is fed into a computer then analyed and changed into useful information
   • Knowledge
     • The ability to understand information and use that understanding to form judgements and decisions.
   • Bias
     • Something used to influence someone's views or opinion.
   • Garbage In, Garbage Out (GIGO)
     • When incorrect information is inputted, incorrect information will be outputted.

2. Data Validation

   • Transcription Error
     • When an error is made due to something being written down incorrectly.
   • Transposition Error
     • When an error is made due to something being misheard.

3. Data Validation Techniques

   • Format Check
     • Checks the data is inputted in the correct format.
   • Range Check
     • Checks that the value falls within a given range,
   • Presence Check
     • Checks the data has been entered into a field.
   • Check Digit
     • The last one or two digits in a code are used to check the other digits are correct.

4. Home Entertainment

   • Interactive Services
     • Shopping, betting, voting, dating
       • Services available on an interactive TV.
     • Subscription
       • Monthly fee, paid regularly to receive unlimited content for agreed period.
     • Pay Per View
       • Paying money each time you view something.
   • Gaming
     • Games are always varied and range from very basic to more complex games. The specification of a computer can be significantly effected where gaming is important.
     • Pros
       • Children can learn form them
       • Encourages teamwork
       • Could lead to employment.
       • Allows people who don't live together to play together.
     • Cons
       • Impact work
       • Less socialisation
       • Can be violent
       • Health problems
     • Gaming Computers
       • High storage
       • Large Screen
       • Decent CPU
       • Large amount of RAM
       • High quality sound card
       • Fast Processor
       • High quality graphics card
   • Digital Photography
     • Advantages
       • Can be viewed immediately
       • Easy to share
       • Easy to edit
     • Disadvantages
       • Get obsessed
       • Over edit pictures to make it look fake
       • Used innapropriately
     • Megapixels
       • Measures number of pixels
       • The higher the megapixel the more detailed the image.
       • Higher image quality increases memory space.
     • Editing software tools
       • Crop
       • Filter
       • Shadow
       • Brightness
       • Shadow
       • Saturation
       • Zoom
       • Remove Redye
       • Perspective
       • Add Text

5. ·