Skip to content
MathsGenie logo
Open app

Course home

  1. A Level
  3. Psychology AQA
  5. Question bank

Inferential testing (A-level only)

EasyMedium
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283
Question 18

An environmental scientist investigates whether a new filtration system reduces microplastic concentration in local water sources. Water samples from several locations are tested before and after the installation of the filtration system. The changes in microplastics are recorded in Table 1.

Table 1: Direction of change in microplastic concentration

Change CategoryDecreased microplastics (+++)Increased microplastics (−-−)No change (0)
Number of locations29135

Use the data in Table 1 to calculate the value of the test statistic S S\,S for a sign test. Explain how you obtained your answer.

[3]

Inferential testing (A-level only) Questions

  1. A Level
  2. /Psychology
  3. /Inferential testing (A-level only)

Practise AQA A Level Psychology Inferential testing (A-level only) with exam-style questions for A Level Psychology. 123 questions, matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank