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Chapter 8 - ICT Data Systems
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- 1What is primary sources of data?Primary sources of data is data that has been collected for a specific purpose by asking people directly for information that is needed.
- 2Give examples on how to get primary sources of data.-Hand out and collect a questionnaire
-hold an interview
For example, a dairy might employ people to stand in a high street and interview people about their preferences for different types of cheeses or butters and records the data - 3What do you have to consider when designing a questionnaire?-The phrasing of questions
-Closed or open questions
-What information you need - 4What are secondary sources of data?Is data that has already been collected previously and been published.
- 5Give examples of secondary data.-On the internet
-in books
-reports
-magazines
-newspapers - 6What are the pros and cons of using secondary data?The pros are that you can...
- buy published market research to save time
-it can help get more data to develop your products
The cons are....
-the results may not be helpful to the people who need it
-May be old and therefore unreliable
-trends may change
-could result in loss of business and less profit if data is wrong
-may be in a different locations - 7What are input devices? Give examplesInput devices that help store and analyse data that needs to be on a computer. These include keyboards, mice, scanners, cameras and voice recognition devices.
- 8What are the pros and cons of input devices?Pros;
-A range allows different types of information to be documented e.g. photos, text, graphs
-most simply connect with USB cable
Cons;
-Could be costly if they don't consider what is necessary/if it will be used
-Keyboards can cause repetitive strain injury causing workers to be unhappy
-If they don't check the device is suitable for the one using it (e.g. for the visually impaired) then it will waste money and reduce morale. - 9What are storage devices? Give examplesStorage devices are devices that store information on the computer. For example hard disks or drives, CDs, DVD's and USB memory sticks.
- 10What are the pros and cons of storage devices?Pros;
-Removable hard drives can increase the size of the data a computer can hold and can back up data so it would not be lost.
-CDS can hold a variety of information (Text, pictures, archives of photos.
-Memory sticks are cheap and make data portable
Cons;
-Memory sticks are venerable to damage
-All external devices need to be backed up regularly as they could be damaged or lost resulting in a waste of time and data - 11What are output devices? give examples.Are devices that take data off the computer in order for it to be used. This includes monitors, printers and projectors.
- 12What are the pros and cons of output devices?Pros;
-TFT screens have lower environmental impact and take up less room
-printers can print in colour and black and white so they have multiple uses
-some projectors can be portable/moving
Cons;
-Medical and safety issues need to be taken into consideration e.g. screens need to have a low flicker rate and be fully adjustable.
-poorly chosen printers could result in a very expensive bills
-Unsuitable devices for presentations could result in a loss of business
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- Fichas sobre Chapter 8 - ICT Data Systems, creado por lovelylaw2 el 12/11/2013.
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