Scenario:
Karen Kabwe, a female public health researcher studying the vaccination rates in a small town with a total population of 2,500 people. She wants to conduct a survey to estimate the proportion of the population that has been vaccinated against influenza this year.
To ensure her survey results are accurate and reliable, she needs to determine an appropriate sample size. She consults you and you decide to advise her to use the following parameters for her survey:
- You want the estimate to be within a 5% margin of error (precision).
- You are aiming for a 95% confidence level.
- From previous studies, you estimate the vaccination rate to be approximately 40%.
Question:
Calculate the sample size needed to achieve Karen's objectives. Show your calculations ;
a) When total population is not Known
b) When total population is known
Good luck on your practice
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