Assume that 300300 births are randomly selected and 144144 of the births are girls. use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high.

The number of girls would neither be significantly high or low. Going off the conventional wisdom that holds that 51% of the population of the world is female, this would mean that 153 females would be born in 300 people, irrespective of viability rate. A random selection of 300 births leading to 144 girls would only be 3% outside the mean value, so this is not a significant difference.