Question

Read the scenarios 1 and 2 below and identify their type of study as

Observational, Cohort, Prospective, Cross-sectional, Retrospective, Case-Control, Randomized experiment, Randomized block experiment or double-blind experiment.

Some studies may have more than one identifier.

Then, explain why you selected that study type.

 Scenario 1: A researcher wants to determine if consuming oatmeal regularly reduces the level of bad cholesterol. She finds 120 adults over the age of 40 who regularly consume oatmeal in their daily diets and she matches each one with a similar adult who does not regularly eat oatmeal as part of their daily diet. She measures the levels of bad cholesterol for each adult for 6 months and compares the results.

 Scenario 2: A school psychologist wants to test the effectiveness of a new computer method for teaching reading to first graders. She recruits 400 first grade students in her school district and randomly divides them into two groups. Group 1 is taught by means of the new computer method, while Group 2 is taught via the traditional method. The same teacher is assigned to teach both groups. At the end of the year, an achievement test is administered and the results of the two groups are compared.

 Scenario 3: Add your own scenario below for a study that is a double blind experiment.

Answer 1

1)

Case-Control

2)

Randomized :

In a randomized experimental design, objects or individuals are randomly assigned (by chance) to an experimental group. Using randomization is the most reliable method of creating homogeneous treatment groups, without involving any potential biases or judgments.

3)

A double-blind study is one in which neither the participants nor the experimenters know who is receiving a particular treatment. This procedure is utilized to prevent bias in research results.

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