Posted: December 27th, 2015

How many participants took part in total? And (assuming equal cell sizes) in each condition?

An educational psychologist hypothesises that teenagers’ confidence improves significantly post GCSEs. She randomly selects a sample of 14 year old students who have not yet taken their GCSEs and additionally randomly selects a separate sample of 15 year old students who have recently taken their GCSEs. She administers a questionnaire which aims to measure students overall mean confidence (using 20 items measuring confidence in an array of domains, such as academic and social, and using a Likert response scale from 1, no confidence at all to 5, completely confidence).

Please see below for her SPSS output:

 

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