A survey has been conducted on 30 students to measure how much time they spend in the University canteen, between 9 am and 9 pm. There are 30 observations in the data-set, measured in minutes:

a. What type of variable is this? And how should it be defined in the SPSS Variable view?

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b. While the chronometer could record minutes and seconds, data were only registered in minutes. Two rounding procedures can be chosen: (a) rounding to the nearest minute (e.g. 10 minutes and 20 seconds = 10 minutes; 10 minutes and 40 seconds=11 minutes); (b) registering only minutes whatever the number of seconds (e.g. 10 minutes and 1 second = 10 minutes, 10 minutes and 59 seconds = 10 minutes). Are the errors generated by rounding through (a) or (b) systematic or random? If systematic errors are generated, are they downward or upward biases?

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