HELP - Stats

 HELP - Stats
Posted: Thursday, February 8, 2018 @ 02:42 PM
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Joined: 15 July 2009
Posts: 144

Hiya

Today we did stats and what stat test to use : I then gave them a resource I found but couldn't answer the first question as the class was divided as to what level of measurement was being used.

so - please confirm this for me 

A psychologist was interested in looking at the relationship between time taken to get to work and stress levels.

Participants were asked to 1. record time it took. 2. grade themselves on a scale how stressed they felt after the journey

Is this ordinal, interval or ratio data - I'm confusing myself greatly here ! ( once we work this out we can decide what test to use ) 


Thank you for any help !


M

Posted: Thursday, February 8, 2018 @ 03:04 PM
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Joined: 8 July 2009
Posts: 169

Hi,

The level of data is ordinal as you are ranking/rating (how stressed on a scale of...), but there isn't an exact difference between two measurements - it's an arbitrary scale. You would do a Spearman's as you're looking at a relationship between the two variables rather than a difference

Posted: Thursday, February 8, 2018 @ 03:38 PM
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Joined: 1 November 2007
Posts: 2075

Time is interval but rating levels of stress is ordinal therefore it will be Spearman rank (looking for a correlation)