Final answer:
The estimate for the population proportion that favors proposition a is 0.54.
Step-by-step explanation:
To estimate the population proportion, we can use the formula p' = x/n, where x represents the number of successes and n represents the sample size. In this case, x = 540 (number of voters favoring proposition a) and n = 1000 (the sample size). So the estimate for the population proportion is p' = 540/1000 = 0.54.