A cognitive psychologist recorded the time, ttt (in seconds), taken by a group of participants to complete a memory retrieval task. Due to the distribution of the data, they grouped the continuous measurements into unequal class intervals as shown in the table below:
| Time, ttt (seconds) | Frequency |
|---|---|
| 0≤t<100 \le t < 100≤t<10 | 15 |
| 10≤t<1510 \le t < 1510≤t<15 | 20 |
| 15≤t<3015 \le t < 3015≤t<30 | 18 |
| 30≤t<6030 \le t < 6030≤t<60 | 12 |
The researcher intends to construct a visual representation of this grouped continuous data where the area of each bar is proportional to the frequency of that interval.
Identify the correct type of display and the height of the bar representing the 10≤t<15 10 \le t < 15\,10≤t<15 interval.
A bar chart with a height of 202020
A histogram with a height of 4.04.04.0
A histogram with a height of 0.250.250.25
A histogram with a height of 202020
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.