EMP Data Collection & Analysis 2

Question 1

Which statistical measure is most useful for identifying outliers in energy consumption data?

Accepted Answer

Interquartile range (IQR)

Answer

The IQR defines the middle 50% of data, and values beyond 1.5×IQR from the quartiles are flagged as outliers.

Question 2

A utility meter records energy use every 15 minutes. What is this interval called?

Accepted Answer

Interval data

Answer

Sub-hourly meter readings captured at fixed time steps are called interval data and are used for detailed load profiling.

Question 3

An energy manager wants to compare the energy efficiency of buildings of different sizes. Which metric is most appropriate?

Accepted Answer

Energy Use Intensity (EUI)

Answer

EUI normalizes energy consumption by floor area (kBtu/sq ft/year), enabling fair comparison across buildings of different sizes.

Question 4

What does a low R² value in a regression model for energy consumption indicate?

Accepted Answer

The independent variables explain little variance in energy use

Answer

A low R² means the chosen independent variables (e.g., weather, occupancy) do not adequately explain the variation in energy consumption.

Question 5

Which data source provides outdoor temperature data most commonly used in energy regression analysis?

Accepted Answer

Heating degree days (HDD) and cooling degree days (CDD)

Answer

HDD and CDD are derived from weather station data and are the standard independent variables for correlating energy use to outdoor temperature.

(EMP) Energy Management Professional Practice Test