Understanding Validity and Reliability

Katy and Sam are conducting a study to see if a new teaching method improves math scores in their class. Which type of validity refers to the extent to which their study accurately measures what it intends to within its own context?

• External validity

• Internal validity

• Face validity

• Ecological validity

Answer explanation

Internal validity refers to the extent to which a study accurately measures what it intends to measure within its own context, ensuring that the results are due to the manipulation of the independent variable.

Beth conducts a study on study habits at her school. What does external validity refer to in her research?

• The consistency of results over time

• The generalisability of findings to other settings or populations

• The appearance of a test measuring what it claims to

• The accuracy of measurement tools

Answer explanation

External validity refers to the generalisability of findings to other settings or populations, meaning how well the results of a study can be applied beyond the specific conditions or group studied.

Tom and Katy are reviewing a new math test to see if it looks like it measures what it is supposed to. The concept they are considering is best described as:

• The degree to which a test appears effective in terms of its stated aims

• The repeatability of results

• The ability to generalise findings

• The accuracy of a measurement

Answer explanation

Face validity refers to how effective a test appears in achieving its stated aims. It assesses the superficial aspects of a test's relevance, making the first answer choice the correct one.

Luci and Harry are conducting a study to see if their findings can be applied to real-world classroom settings. Which type of validity are they most concerned with?

• Internal validity

• Ecological validity

• Face validity

• Test-retest reliability

Answer explanation

Ecological validity refers to how well research findings can be generalized to real-world settings. It assesses the applicability of study results outside the controlled environment, making it the correct choice for this question.

Joe and Harry both take the same math test twice, a few weeks apart. The results are compared to see if the scores are similar each time. What does this process measure?

• The accuracy of a test

• The consistency of results when a test is repeated over time

• The generalisability of findings

• The appearance of a test’s effectiveness

Answer explanation

Test-retest reliability assesses the consistency of results when a test is repeated over time. This means that if the same test is administered again, it should yield similar results, indicating reliability.

Joe and Katy are both observing a classroom to record how many times students ask questions. Which of the following best describes the concept being demonstrated if their results are consistent with each other?

• Consistency of results between different researchers or observers

• Consistency of results over time

• The degree to which a test measures what it claims

• The generalisability of findings

Answer explanation

Inter-observer reliability refers to the consistency of results obtained by different researchers or observers when measuring the same phenomenon. This ensures that findings are not dependent on a single observer's interpretation.

Lewis and Freya both take a psychology test, and their answers to similar questions within the test are very consistent. This consistency of results within a single test is known as:

• The accuracy of a test

• The consistency of results within a single test

• The generalisability of findings

• The appearance of a test’s effectiveness

Answer explanation

Internal consistency reliability measures how consistently a test produces similar results across its items. Therefore, the correct choice is 'The consistency of results within a single test'.

Katy and Joe are conducting a sports science experiment to measure sprint times. Why is reliability important in their research?

• It ensures results can be repeated and trusted

• It increases the generalisability of findings

• It improves the appearance of a test

• It reduces the need for evidence-based practice

Answer explanation

Reliability is crucial in sports science research as it ensures results can be repeated and trusted. This allows researchers to have confidence in their findings and supports the validity of their conclusions.

Sam and Luci are designing a science experiment to measure plant growth. Which of the following is most likely to impact the validity of their measurement?

• Accuracy

• The number of participants

• The cost of equipment

• The length of the test

Answer explanation

Accuracy directly affects the validity of a measurement, as it determines how close the measurement is to the true value. Other factors like participant number, equipment cost, and test length may influence reliability but not validity.

Mikey and Freya are both measuring the length of a table using the same ruler. Precision in their measurement primarily affects:

• Validity

• Reliability

• Ecological validity

• Face validity

Answer explanation

Precision in measurement primarily affects reliability, as it ensures consistent results across repeated measurements. Higher precision leads to greater reliability, while validity and ecological validity relate to the accuracy and applicability of the measurements.