TABLE OF CONTENTS International Enterprises plc is an extensive user of personal computers with more than 12 000 installed worldwide. In the United Kingdom alone there are more than 9500 in use.
The firm wishes to conduct a survey to establish how their users regard the personal computer service offered by the firm. It is realized that the total number of personal computer users is too large to be able to survey them all. Therefore it is agreed to use a sampling technique.
After much discussion it was decided that in the first instance only the office system OA2000 would be surveyed. There are 2750 users of this system.
Management have asked the survey team to design the measuring procedure so that they can have 95% confidence that their results will be accurate to within 2%.
How big a sample will they need to measure the OA2000 system?
How will the sample size change if management change their mind and want to have 99% confidence that their results are accurate to within 1%?
After completing the OA2000 review International Enterprises plc want to extend the survey to include all the other users in the United Kingdom. How big must the sample be if management want 5% accuracy and a confidence level of 95%?
There are two ways in which a sample size needs to be calculated. First, there is the issue of measuring a percentage of a population, and second, there is the issue of...
