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I recently learned about Level of measurements and I am really confused in this MCQ where I think the right answer is a and d both. Lets say the three participants finished the race in 45 seconds,35 seconds and 30 seconds, this is a interval data since there is fixed order and 0 has no meaning and if we convert it to ordinal 30s becomes first 35s second and 45 second third,according to this option a perfectly fits. What am i missing here?

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In my opinion etc. is playing key role here. Ordinal data must have the fixed length, which is not in this case as we can go on even further as 1st,2nd,3rd,4th,.. and so on. There is no end to this. You can argue that there must be fixed number of runners(say 50) and hence we have only 1-50 rank. But it is not mentioned in question hence this assumption is not valid.

If no of atheletes participating were mentioned then you're right.

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