CPT Research Methods & Evidence-Based Practice 3

Question 1

A tutor selects only students from their own caseload for a study on study skills. This sampling method is called:

Accepted Answer

Convenience sampling

Answer

Convenience sampling selects participants who are readily available, which may limit generalizability.

Question 2

Which statistical measure is most resistant to the influence of extreme outliers in a dataset?

Accepted Answer

Median

Answer

The median is the middle value in a ranked dataset and is not mathematically affected by extreme scores the way the mean is.

Question 3

A tutor implements a new math strategy and tracks one student's performance daily using baseline and intervention phases. This is an example of:

Accepted Answer

Single-subject research design

Answer

Single-subject (or single-case) research design tracks one individual across baseline and treatment phases to evaluate intervention effects.

Question 4

Which of the following best describes a p-value of 0.03 in a tutoring intervention study?

Accepted Answer

There is a 3% chance of obtaining results at least this extreme if the null hypothesis were true

Answer

A p-value represents the probability of observing results as extreme as those found, assuming the null hypothesis is true.

Question 5

A tutor reads a study where the researcher knew which students received the intervention when measuring outcomes. This introduces:

Accepted Answer

Observer bias

Answer

Observer bias occurs when the evaluator's knowledge of group assignment influences how they measure or rate outcomes.

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