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Researchers were interested in better understanding how children with autism see

ID: 3292212 • Letter: R

Question

Researchers were interested in better understanding how children with autism see and understand the world. Participants included children diagnosed with autism and typically developing children, who were all approximately the same age. All children were presented with several different stimuli on a large computer screen for up to one minute. The stimuli were both social (i.e., people’s faces) and nonsocial (inanimate objects). The percentage of time children spent looking at the two types of stimuli were recorded (ranging from zero to 100). The results are presented below:

This is a Factorial design.

1. What type of factorial design is this (independent groups, repeated measures, or mixed)? Explain how you reached your answer.

2. What kind of design is this (put your answer in the ___ x ___ form)?

3. At least how many participants will need to be recruited if the researchers want to have 30 observations per cell?

4. The researchers calculated that for a result to be statistically significant the difference seen between comparison groups should be greater than 15% points. Given this information…

a. Describe whether or not there is a main effect for each Independent variable you identified. You must also interpret these findings.

b. Are there any interactions in the study? Interpret these findings.

Stimulus Type Social Nonsocial 50% 80% 83% 50% With Autism Diagnosis Typically Developing

Explanation / Answer

Part 1:

These are being analysed in a mixed factorial design.

Part2:

It’s a 2X2 design:

There are two independent variables, with two cases each interaction.

Part3:

30*4 = 120 students need be recruited.

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