EXM.1.AHL.TZ0.19
A company sends a group of employees on a training course. Afterwards, they survey these employees to gather data on the effectiveness of the training. In order to test the reliability of the survey, they design two sets of similar questions, which are given to the employees one week apart.
The questions in the survey were grouped in different sections. The mean scores of the employees on the first section of each survey are given in the table.
State the name of this test for reliability.
State a possible disadvantage of using this test for reliability.
Calculate Pearson’s product moment correlation coefficient for this data.
Hence determine, with a reason, if the survey is reliable.
Markscheme / solution
Parallel Forms A1
[1 mark]
EITHER
The two sets of questions might not be of equal difficulty R1
OR
It is time consuming to create two sets of questions R1
[1 mark]
A2
[2 marks]
Since the value of is close to +1, R1
The survey is reliable. A1
[2 marks]