Unit 1 Flashcards
What is Information?
Data that has been processed to give it meaning
What is knowledge?
Information with a set of rules applied to it - a conclusion has been drawn
What does GIGO stand for and what does it mean?
Garbage In, Garbage Out
If something is input wrong into the computer, the output will also be wrong
What are the four types of validation checks? Brief description on each
Range check - check numbers are between a certain range
Format check - correct mix of letter and numbers checked
Presence check - check the field is not left empty
Check digit - extra number at the end of a set of numbers to check, through calculation, if the previous numbers are correct
Lists - forced to make a choice from a drop down list of options so only valid data can be entered
What is a transcription error?
Errors when copying data onto a computer (could be caused by bad handwriting)
What is a transposition error?
Characters are accidentally swapped around (accidentally pressing the wrong key)
What are good ways for minimising errors on a computer?
Visually check (proofread) Double key (enter data twice and check they are the same)
What are some characteristics of good quality data?
True and correct
Fit for purpose
Unbiased
What are some examples of interactive TV services?
Pay-To view: eg - buying a movie on demand Shopping Betting Dating Voting
What are typical 1)input 2)output devices for gaming?
1) joysticks, steering wheels, game controllers
2) speakers, television equipment, vibration feature on remote
What are the advantages and disadvantages of gaming?
Ad: some educational, develop team working skills
Dis: sedentary, can lead to obesity and other health issues
Examples of image manipulation?
Cropping, red eye reduction, filters
What are megapixels?
Used to compare the quality of images taken, the more the better.
Made up of one million pixels (pixel is a dot of light)
What devices does digital photography involve? Examples of each
Input - image sensors
Storage - flash memory, built in memory
Output - screen, printer
What is Data?
Raw facts or figures
What does a webcam do?
Transmit still photos and videos across the internet
What are Facebook/my-spaces uses? (Social networking)
Get in touch with people
Find old friends and get in touch
Post videos and images
Download music
Join groups with people with a similar interest
Comment on others profiles, pictures and videos
What does downloading mean?
Taking a file from the internet and saving a copy of it
What are the disadvantages of downloading?
Puts the device at risk of virus’s
Accidentally (or not) downloading illegally are at risk of getting their internet access blocked
What are the ways in which a device can connect to the internet? Brief description of each
Broadband - connect using high speed data link
Satellite - beamed data signals from satellites orbiting the earth
Mobile - connect via a telephone company
Dial up - connect to telephone lines by dialling your internet service providers (ISP) number.
Cable - connect to cable company, often comes in packages with TV service
What are the three types of connection technology?
Wireless
Bluetooth
GIS (Geographical Information Systems)
What are the advantages and disadvantages of wireless technology?
Ad: can use it in various places (WIFI hotspots), no wires needed
Dis: easier for hackers when using in a public spot, possible health risk
What are the advantages and disadvantages of Bluetooth technology?
Ad: no cables needed, quick to set up, no new computer software needed
Dis: only be used in a short distance (same room), possible health risk
What are the advantages and disadvantages of GIS (Geographical information Systems)?
Ad: Save money and environment by choosing shortest route, plan time using it’s ETA (estimated time of arrival) system
Dis: send large cars/lorries down rural routes where they won’t fit, sometimes data is not up to date, can distract drivers
What is an online shopping sight behind the professionally designed page?
A large database
What are the advantages and disadvantages of online shopping for the business?
Ad: wider customer base, trading can be at any time, cheaper (no shop bought or rented)
Dis: if the server fails business is lost, customers without the internet are lost, high initial set up costs
What is double keying and why is it used when buying online?
Customers are made to enter key information twice to check it is correct
What are the different ways (using ICT) that attendance can be taken at school?
Paper based (by hand) Keyboard entry Optical mark recognition (OMR) (by hand then scanned into computer) Smart cards (students place them into card readers) Magnetic strip cards (students swipe to let them into school) Biometric (fingerprints or eyes scanned)
What does MIS stand for and what does it do?
Management Information Systems - used by managers to provide them with data and statistics so they can make decisions
What are data logging systems and when is it used in schools and why?
The collection of data over a period of time using sensors linked to the computer. Often used in science experiments, automatic data collection is more accurate (but can be expensive)