For each of the following scenarios, indicate whether we would use time series o

Question

For each of the following scenarios, indicate whether we would use time series or cross-sectional data. ITEMS TO SEE IF THERE ARE DIFFERENCES IN THE AVERAGE NUMBER OF CALORIES CONTAINED IN SCHOOL LUNCHES TO COMPARE THE INSECT POPULATION IN A GEOGRAPHIC REGION BEFORE AND AFTER AN INSECTICIDE WAS APPLIED TO DETERMINE IF ENROLLMENT IN HIGHER EDUCATION IS INCREASING. TO COMPARE THE CURRENT PRICE OF A GALLON OF GASOLINE ACROSS DIFFERENT GASSERVED IN EACH STATIONS IN LOS ANGELES, CA. OF THE FIFTY STATES ON DECEMBER 1, 2015. CATEGORY Time Series Data Cross-Sectional Data

Explanation / Answer

First of all we need to understand the use of time series data and cross sectional data representation and analysis.

We use time series data when comparing different time periods. For example, population growth or reduction over the years. Here, we compare data between different years. While the value (y-axis) could be the same. Here, for instance the value is the number of people in a given location. The location does not change but the time changes by years. This is why we use a time series data.

Cross sectional data on the other hand takes into consideration a single time period (or no time period) and compares two attributes. For example, population distribution across different states. Here, we are not mentioning time but we want to know the difference in the value of population across the attribute of locations. In such cases we use cross sectional data.

Once, you understand the above, we can easily identify what kind of data will be used for the mentioned items.

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