Which of the following statements is TRUE?

Group of answer choices

In a typical two-dimensional data file, the columns refer to the unique observational units and the rows refer to the variables

With regard to different data collection techniques, store scanner data is an example of cross-sectional data while a one-time phone poll is an example of time-series data

A vector is an object denoting an event, act, characteristic or quantity that can be measured and assigned a value

In a market for normal goods where prices are periodically cut for a week-long period, a weighted average of weekly prices will generally be lower than an unweighted average of weekly prices