COM Data Analysis & Decision Making 2

Question 1

A operations manager notices that defect rates spike every Monday morning. Which analytical approach best identifies the root cause?

Accepted Answer

Time-series disaggregation by shift and day

Answer

Time-series disaggregation breaks data by time segments (shift, day) to isolate patterns linked to specific operational conditions like Monday startup procedures.

Question 2

When using a decision matrix to choose between capital equipment options, which scoring approach ensures objectivity?

Accepted Answer

Weight criteria by importance, then score each option against each criterion

Answer

A weighted decision matrix assigns importance weights to criteria before scoring, preventing any single factor from dominating the decision.

Question 3

A plant manager wants to reduce inventory carrying costs. Which data metric is most directly relevant?

Accepted Answer

Inventory turnover ratio

Answer

Inventory turnover ratio measures how frequently inventory is sold and replaced, directly indicating carrying cost efficiency.

Question 4

What does a p-value below 0.05 indicate in an operational hypothesis test?

Accepted Answer

The result is statistically significant at the 95% confidence level

Answer

A p-value below 0.05 means there is less than a 5% probability that the observed result occurred by chance, indicating statistical significance.

Question 5

An operations team is comparing two process improvement methods. Which statistical test is most appropriate for comparing their mean output rates?

Accepted Answer

Two-sample t-test

Answer

A two-sample t-test is designed to determine whether the means of two independent groups are statistically different from each other.

(COM) Certified Operations Manager Practice Test

(COM) Certified Operations Manager Practice Test

COM Data Analysis & Decision Making 2