Normal Hypothesis Testing (Edexcel A-Level Mathematics): Quizzes

Assumption of no effect or difference

Assumption of effect or difference

0.05 (5%) or 0.01 (1%)

Prob. of result as extreme, assuming $H_0$

Threshold test statistic must exceed

$z = \frac{\bar{x} - \mu_0}{\frac{\sigma}{\sqrt{n}}}$

-1.645

980 hours

When test statistic < critical value

When p-value < significance level