ENGV 380 Quiz 2 Costs and Engineering Estimates Complete Questions & Answers 30 30 Libert

ENGV 380 QUIZ 2 - COSTS AND ENGINEERING
ESTIMATES COMPLETE QUESTIONS &
ANSWERS 30/30 LIBERTY UNIVERSITY 2026
129 QUESTIONS

TABLE OF CONTENTS

# TOPIC

1 Demonstrate mastery of core concepts

2 ENGV 380 Quiz 2

3 Costs and Engineering Estimates Complete Questions & Answers 30

4 30 Liberty University 2026

5 Foundations of ENGV 380 Quiz 2 - Costs and Engineering Estimates Complete Questions & Answers
30/30 Liberty University 2026

6 Applied ENGV 380 Quiz 2 - Costs and Engineering Estimates Complete Questions & Answers 30/30
Liberty University 2026

7 Advanced ENGV 380 Quiz 2 - Costs and Engineering Estimates Complete Questions & Answers 30/30
Liberty University 2026

8 ENGV 380 Quiz 2 - Costs and Engineering Estimates Complete Questions & Answers 30/30 Liberty
University 2026 Review


ABSTRACT

This study document brings together 129 carefully worded exam questions drawn from ENGV 380
Quiz 2 - Costs and Engineering Estimates Complete Questions & Answers 30/30 Liberty University
2026, with the strongest emphasis placed on Demonstrate mastery of core concepts, ENGV 380
Quiz 2 and Costs and Engineering Estimates Complete Questions & Answers 30. Every item
follows the wording style and level of reasoning you meet in the real paper, and each one is paired
with a clear rationale so the correct choice is never a guess. Work through the set at your own
pace, mark the questions that slow you down, then come back to them until the reasoning feels
automatic. Learners who revise this way walk into the exam room recognising the pattern behind
the questions instead of meeting them for the first time. Keep going - steady, honest practice is
what turns a difficult paper into a comfortable pass.




Page 1

,Q1 DEMONSTRATE MASTERY OF CORE CONCEPTS
A firm's learning curve is best described by the Wright model with an 85% slope. If
the first unit required 1,000 labor hours, which expression correctly gives the
cumulative average time per unit for the first 16 units?
A. 1000 × 16^(log2(0.85)) CORRECT

B. 1000 × 0.85^(log2(16))

C. 1000 × 16^(log10(0.85))

D. 1000 × 0.85 × 16^(log2(0.85))

RATIONALE: The Wright cumulative-average model is Y = a-X^n, where n = log(slope)/log(2) =
log2(slope). For X = 16 units, cumulative average = 1000 × 16^(log2 0.85). Option B misplaces
the exponent, C uses log10, and D inserts a spurious multiplicative slope factor.




Q2 DEMONSTRATE MASTERY OF CORE CONCEPTS
In a probabilistic cost estimate, the P50 value of a triangular distribution with
optimistic $100K, most likely $180K, and pessimistic $320K is closest to which
value?
A. $180K

B. $200K CORRECT

C. $213K

D. $240K

RATIONALE: The triangular CDF inverse for P50 is a + ((ma)(pa)/2) = 100 + (80×220/2) 100 +
93.8 = $193.8K $200K. The mean (a+m+p)/3 = $200K coincides here, but the median is the
correct P50 metric. Options A, C, D confuse mode, mean, or arbitrary quartiles.




Page 2

,Q3 DEMONSTRATE MASTERY OF CORE CONCEPTS
Which cost-estimating technique is most defensible when only a functional
description of a novel system is available and historical analogous data are
sparse?
A. Detailed bottom-up estimate from vendor quotes

B. Parametric estimate using validated cost-estimating relationships CORRECT

C. Unit-price estimate from a recent similar project's bid tabulation

D. Grassroots estimate assembled by the construction contractor

RATIONALE: Parametric CERs link cost to measurable physical or performance parameters and
can be applied when only functional data exist. Bottom-up and grassroots methods require
design detail; unit-price methods require analogous bid data, which the stem says are sparse.




Q4 DEMONSTRATE MASTERY OF CORE CONCEPTS
A project's cost estimate shows a 90% confidence level of $4.2M and a 10%
confidence level of $2.8M. If costs are approximately normal, the standard
deviation of the estimate is closest to:
A. $0.35M

B. $0.55M CORRECT

C. $0.70M

D. $1.40M

RATIONALE: For a normal distribution, the 10th and 90th percentiles are ±1.2816 from the mean.
Range = 4.2 2.8 = 1.4M = 2(1.2816), so 1.4/2.563 $0.55M. Options A, C, D misapply the
z-multiplier or halve/double the range incorrectly.




Page 3

, Q5 DEMONSTRATE MASTERY OF CORE CONCEPTS
Which element of a work breakdown structure (WBS) is most directly responsible
for enabling a defensible bottom-up cost estimate?
A. The WBS dictionary defining scope boundaries and deliverables CORRECT

B. The organizational breakdown structure mapping to departments

C. The responsibility assignment matrix (RAM) linking roles to tasks

D. The network diagram sequencing dependent activities

RATIONALE: The WBS dictionary provides scope descriptions, deliverables, and assumptions
that let estimators price each work package without overlap or omission. OBS, RAM, and
network diagrams support accountability, staffing, and scheduling-not the cost-definition basis
itself.




Q6 DEMONSTRATE MASTERY OF CORE CONCEPTS
A firm applies a 12% cost of capital and must choose between two mutually
exclusive machines with unequal lives. Which method yields the economically
correct ranking?
A. Choose the machine with the higher simple payback period

B. Choose the machine with the lower accounting rate of return

C. Compare equivalent annual annuities (EAA) derived from NPVs CORRECT

D. Compare internal rates of return directly

RATIONALE: When lives differ, NPVs are not directly comparable; converting each NPV to an
equivalent annual annuity normalizes to a common annual basis. Payback ignores time value,
ARR ignores cash-flow timing, and IRR ranking can mislead with scale or reinvestment
differences.




Page 4