Dr. Aris wanted to investigate patient adherence to a new digital health coaching application designed for hypertension management. He compared patients from urban clinics with patients from rural clinics over a 6-month trial period.
He sampled:
At the end of the trial, Dr. Aris classified each patient's adherence level. Patients who logged their meals and blood pressure at least 5 days a week were classified as 'High Adherence', and those who logged less frequently were classified as 'Low Adherence'.
| Location | Patients with 'High Adherence' | Patients with 'Low Adherence' |
|---|---|---|
| Urban | 6 | 18 |
| Rural | 14 | 12 |
Complete Table 2 to calculate the chi-squared statistic (χ2\chi^2χ2) for Dr. Aris's data to two decimal places.
| Observed (O) | Expected (E) | O–E | (O–E)2(O–E)^2(O–E)2 | (O–E)2/E(O–E)^2 / E(O–E)2/E | ||
|---|---|---|---|---|---|---|
| Urban | ‘High Adherence’ | 6 | 9.6 | |||
| ‘Low Adherence’ | 18 | 14.4 | ||||
| Rural | ‘High Adherence’ | 14 | 10.4 | |||
| ‘Low Adherence’ | 12 | 15.6 | ||||
| Chi-squared (χ2\chi^2χ2) = |
Practise Edexcel A Level Psychology Research methods and skills with exam-style questions for A Level Psychology. 657 questions covering Research methods and skills, matched to the Edexcel A Level Psychology (9PS0) 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.
