Experimental Design Concepts

The video tutorial explains two main types of experimental study designs: between group and within group designs. In a between group design, each participant is measured once, and the study involves different groups such as control and experimental groups. An example is given using lung capacity measurements of smokers. In a within group design, participants are measured multiple times, often over a period, to assess changes due to interventions. The video compares these designs, highlighting that between group designs have one data point per participant, while within group designs have multiple data points over time.

What is a key decision researchers must make when designing an experimental study?

• Determining the study location

• Selecting between a between-group or within-group design

• Deciding on the study duration

• Choosing the sample size

In a between-group design, how many times is each participant measured?

• Multiple times

• Only once

• Twice

• Not at all

What is represented by the bars in the lung capacity graph for the between-group design?

• Average scores of participants

• Individual scores

• Maximum scores

• Minimum scores

In a within-group design, what is the purpose of having a control group?

• To serve as a baseline for comparison

• To receive the treatment

• To increase the sample size

• To reduce the study cost

What is the main focus of a within-group design study?

• Comparing different groups at a single point in time

• Determining the fastest method of data collection

• Measuring changes within the same group over time

• Analyzing the cost-effectiveness of treatments

How is the effectiveness of a treatment assessed in a within-group design?

• By measuring changes over time within the same group

• By comparing different groups

• By surveying participant satisfaction

• By analyzing the cost of the treatment

What is a characteristic of a between-group design?

• Data points collected over time

• Multiple data points per participant

• One data point per participant

• No data points collected

In a within-group design, what indicates that the study is measuring over time?

• The use of a placebo

• A single measurement from each participant

• Multiple measurements from the same participants

• The presence of a control group

What is a key difference between between-group and within-group designs?

• The location of the study

• The number of data points per participant

• The type of data collected

• The number of participants

Which design is likely used if measurements are taken over a period of time?

• Between-group design

• Within-group design

• Cross-sectional design

• Case-control design