got wrong 02

Question 1

explain what is meant by normal test data, abnormal test data and extreme test data.

Answer 1

Normal data – data within a range/appropriate data type

Abnormal data – data outside range/ wrong data type

Extreme data – data on the boundaries of the range

Question 2

Doctors use an expert system to help them with their diagnoses of illnesses.
- The symptoms are typed in by the doctors.
Describe the processing which the system uses so that it can suggest possible illnesses.

Answer 2

1. User interface asks questions….
   👉….based on previous responses
2. Inference engine compares data
   👉held in knowledge base…
   👉…using rules base
3. Matches to the symptoms are found

Question 3

Describe batch processing of data, using the processing of bank cheques as an
example.

Answer 3

• Data are collected together
• during the course of the day
• Data are processed all at once
• Data are processed overnight
• Dank accounts updated following morning
• No human intervention

Question 4

types of data protection 4

Answer 4

Biometric methods – unique so only authorized users will have access

Encryption makes it difficult for unauthorised users to read data

Firewall – makes it difficult for unauthorised computers to access the system

Access levels – only users with appropriate permissions can access data

Question 5

Describe how a microprocessor-controlled burglar alarm system operates

Answer 5

1. Microprocessor
   checks input from the user is authentic
   continually monitors sensors.
2. If
   infra-red sensor reading changes
   pressure greater than pre-set value…
   sound greater than pre-set value…
3. Microprocessor
   sends signal to sound alarm sends signal to house lights.
   automatically sends message/calls/texts owner