Hypothesis testing — practice question

Each July, as part of a research project, Rita gathers information on sightings of one particular species of bird. On every day in July she records whether or not she sees this bird, and she counts the number $X$ of days on which it is observed. She represents the distribution of $X$ by $\mathrm{B}(31, p)$, where $p$ is the chance of seeing this bird on a randomly selected day in July. Results from earlier years indicate that $p = 0.3$, but in 2022 Rita thought that the value of $p$ might have fallen. She chose to perform a hypothesis test. During July 2022, she observed this bird on $4$ days.