Final answer:
The best point estimate of the population proportion of boys born to parents using the YSORT method is 0.84, based on a sample proportion of 0.842.
Step-by-step explanation:
To find the best point estimate of the population proportion of boys born to parents using the YSORT method, we can use the sample proportion (p') as this estimate. Given that p' = 0.842, this becomes the point estimate for the population proportion. In other words, the best estimate for the population proportion is 0.84 (rounded to two decimal places), which means it is estimated that 84% of births result in a boy when using the YSORT method.