AQA A-Level Mathematics Statistics overview quiz quiz

$5$

$10$

$20$

$25$

$P(A) + P(B)$

$P(A)\,P(B)$

$P(A) - P(B)$

$\frac{P(A)}{P(B)}$

Quota sampling by interviewer

Opportunity sampling of those nearby

Simple random sampling

Stratified sampling by subgroup

$3$

$9$

$0.3$

$6$

$z = \frac{x - \mu}{\sigma}$

$z = \frac{\mu - x}{\sigma^2}$

$z = x\sigma + \mu$

$z = \frac{\sigma}{x - \mu}$

Sum to zero

Each equal one

Sum to one

Decrease as $x$ increases

The frequency density

The class width

The cumulative frequency

The frequency

$\frac{P(A \cap B)}{P(B)}$

$\frac{P(A \cap B)}{P(A)}$

$\frac{P(A)\,P(B)}{P(A \cap B)}$

$P(A) + P(B) - P(A \cap B)$

$p = 0.4$

$p < 0.4$

$p > 0.4$

$p \ne 0.4$

A varying number of trials that can change between observations

More than two distinct possible outcomes on each separate trial

A continuous variable measured rather than a count of successes

Independent trials with a constant probability of success

$95$ percent

$50$ percent

$68$ percent

$99.7$ percent

Accept the null hypothesis

Reject the null hypothesis

The test is inconclusive

Increase the sample size