CGM Data Collection & Analysis 2

Question 1

Which sampling method divides a turf area into zones and randomly selects samples from each zone?

Accepted Answer

Stratified random sampling

Answer

Stratified random sampling divides the population into subgroups (strata) and samples randomly within each, improving representativeness.

Question 2

A grounds manager collects soil pH data over 5 years and notices a steady decline. This type of analysis is called:

Accepted Answer

Trend analysis

Answer

Trend analysis examines data over time to identify consistent patterns or directional changes in a variable.

Question 3

What does a high coefficient of variation (CV) in soil test results indicate?

Accepted Answer

High data variability relative to the mean

Answer

A high CV indicates that the standard deviation is large relative to the mean, reflecting high variability in the dataset.

Question 4

Which data visualization tool is most appropriate for showing the frequency distribution of soil compaction readings?

Accepted Answer

Histogram

Answer

A histogram displays the frequency distribution of continuous data by grouping values into bins, ideal for compaction readings.

Question 5

When using a penetrometer to measure soil compaction, readings should be taken when soil moisture is:

Accepted Answer

At field capacity

Answer

Penetrometer readings are most meaningful and comparable when soil is at field capacity, a standardized moisture condition.

(CGM) Certified Grounds Manager Practice Test