Biology 9700/52 — May/June 2019
Cambridge A-Level · Planning, Analysis and Evaluation · worked solutions for every part, with the mark scheme
Topics Planning · Analysis, Conclusions and Evaluation
Some students wanted to determine the reaction time of a sample of people aged from 5–80 years.
The students found three different methods of testing reaction time, as described in Fig. 1.1.
The students decided that Method 2 was the most suitable to use for testing subjects aged from 5–80 years.
Suggest two reasons why Method 2 is the most suitable.
State the independent variable and the dependent variable in Method 2.
independent variable = ______
dependent variable = ______
Describe how the students could investigate the reaction time of a sample of people aged from 5–80 years, using Method 2.
Your description should be set out in a logical order and be detailed enough to let another person follow it.
Details of Method 2, as described on page 2, are not required.
The students found some results on the internet for a reaction time test, as shown in Fig. 1.2.
The error bars show standard deviation ().
The percentage change in mean reaction time for males between the ages of 5 years and 10 years is 47%.
Calculate the percentage change in mean reaction time for females between the ages of 5 years and 10 years. Show your working and give your answer to the nearest whole number.
______
State two conclusions about the trends shown by the results in Fig. 1.2.
1 ______
2 ______
State a suitable statistical test that the students could use to find out if the difference in reaction times between males and females of the same age was significant.
Give a reason for your answer.
name of test ______
reason ______
Suggest a null hypothesis for the test that you have chosen in (iii).
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