- Created by: Avneet Aulakh
- Created on: 22-02-19 17:45
Considerations when designing investigations
- Time and cost to set up and carry out investigation
- Ethical issues- you must respect people's dignity and rights
- Confidentiality- it is important to keep data secure and confidential
- Convenience of getting data locally
- Identifying the population and method to collect sample data
- Planning to gain response than you think you need, in case of non- response
- Doing a pilot survey to help work out likely responses to sensitive questions
- Planning what to do with anamolous results
Planning for non- response when designing an inves
- Decide on the number of responses you need to do a valid analysis of data
- Do a pilot survey to work out the proportion of surveys which are likely to be returned
- Use this proportion to work out how many surrveys to send
Calculating the number of surveys
For a survey, 300 responses are needed.
In the pilot survey, 50 questionnaires are sent out. 40 responses are recieved.
The proportion of responses recieved is 40/50 =4/5
The total number to be sent out can be called 'x', so to recieve 300 responses to the full survey, you need:
4/5 = 300/x, so 'x' = 5 x 300/4
= 375 surveys
You need to send out 375 surveys.