"Threaded Problem: Tornado The data set “Tornadoes_2017” locat...

Question

"Threaded Problem: Tornado The data set “Tornadoes_2017” located at www.pearsonhighered.com/ sullivanstats contains a variety of variables that were measured for all tornadoes in the United States in 2017. For each of the following variables in the data set, indicate the level of measurement of each variable.

Length"

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Accepted Answer

Welcome back everyone. In this problem, we want to identify the level of measurement for the variable time spent in hours on homework by a student in a week. A says it's nominal, B ordinal, C interval, and D says it's a ratio. Now what do we know about this variable? Well, since we're talking about time spent in hours, we know that this is a numerical measurement. So this could be maybe an hour spent on homework. Uh, it could be 3 hours spent on homework, 5 hours, and so on. What else do we know? Well, we know that it has a true 0. In other words, 0 hours means no time spent, and we also know that the ratios are meaningful. In other words, we can compare different hours. 6 hours is twice as much as 3 hours, uh, 3 hours is 3 times as much as 1 hour. So now the question is which level of measurement shares these three criteria? Well, it would be the ratio level. Therefore, D is the correct answer. We can be sure we're right by by reviewing the remaining choices. In answer choice A, we know it's not nominal data because nominal data involves categories with no order, but that doesn't apply to time since it's a numerical measurement. Ordinal data involves ordered categories but doesn't allow for equal intervals or meaningful ratios, and that doesn't fit the time spent. And in answer to a C, interval data has equal intervals, but it doesn't have a true zero, and that's not the case for the time spent in hours on homework. Remember we said zero hours means no time spent. Therefore, D is the correct answer. Thanks a lot for watching everyone. I hope this video helped.

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