Essay type test are not reliable because

The correct answer is: C. Their checking is affected by examiner’s mood.

Essay type tests are not reliable because their checking is affected by examiner’s mood. This is because different examiners may have different standards for grading essays, and their mood on the day of grading may affect how they score the essays. Additionally, essays are often subjective, which means that there is no one right answer, and different examiners may interpret the same essay differently. This can lead to inconsistencies in grading, which makes essay type tests less reliable than other types of tests.

Here is a brief explanation of each option:

• A. Their answers are different. This is not necessarily a bad thing, as it shows that students are thinking critically and coming up with their own ideas. However, it can make it difficult to compare the results of essay type tests, as different students may answer the questions in different ways.
• B. Their results are different. This is similar to option A, and it is also not necessarily a bad thing. However, it can make it difficult to compare the results of essay type tests, as different students may answer the questions in different ways.
• C. Their checking is affected by examiner’s mood. This is the main reason why essay type tests are not reliable. As mentioned above, different examiners may have different standards for grading essays, and their mood on the day of grading may affect how they score the essays. This can lead to inconsistencies in grading, which makes essay type tests less reliable than other types of tests.
• D. Their responding styles are different. This is also a factor that can affect the reliability of essay type tests. Some students may be better at writing essays than others, and their responding styles may also vary. This can make it difficult to compare the results of essay type tests, as different students may be better at writing essays than others.