Quick questions on Hypothesis testing: null and alternative hypotheses, significance levels and critical regions - Edexcel A-Level Maths

Every test on the paper follows the same five steps. First, define the parameter and state $H_0$ and $H_1$, deciding whether the alternative is one-tailed or two-tailed from the wording. Second, state the distribution of the test statistic assuming $H_0$ is true, such as $X \sim B(n, p_0)$. Third, calculate the probability of a result as extreme as, or more extreme than, the one observed (or find the critical region).

State suitable hypotheses for a two-tailed test that a proportion has changed from $0.3$. [2 marks]

For $X \sim B(10, 0.2)$, $H_0: p = 0.2$, $H_1: p > 0.2$ at $5\%$, you observe $X = 5$. Given $P(X \ge 5) \approx 0.0328$, state the conclusion. [3 marks]