Q5. Appropriate sample size Finally, I am concerned that the sample of 400 Australians is too small to provide accurate results as this seems hardly enough data. For a survey we intend to undertake next year, we would like to be able to: {a} calculate approximately the average monthly payment ("Monthlyjayment") amount people are willing to pay in order to have net zero emission electricTty bills through renewable energy to within 330, and {b} estimate the proportion of Australian residents that have at least some level of concern ("Concerned\") regarding the uptake of renewable energy technologies to within 3%. Therefore, how many Australian residents would we need to include in next year's survey to satisfy both of these requirements