A linear regression of nitrate concentration (mg/L) versus time (years) gives slope b = 0.42 with standard error s_b = 0.10 and n = 22 data points. What is the t-statistic used to test whether the slope is significantly different from zero?
Mathematics Probability Statistics
Question · Easy
OSHA noise limits
Short
BOD first-order decay
Environmental Science & Chemistry
Flashcard
The first-order decay rate constant for a contaminant is k = 0.23 day^-1. What is its half-life?
Kind of explicit numerical method that approximates a derivative with a divided difference to step an initial-value problem forward one interval at a time.
Mathematics
Guess the Term
Introduction, Mathematics & Ethics
Exam Format, NCEES CBT Logistics & Blueprint Map
Study guide
Cheat sheet
Eight effluent total nitrogen samples (mg/L) yielded a sample mean of 12.4 with standard deviation 2.1. What is the 95% two-sided confidence interval for the population mean (use t_0.025,7 = 2.365)?
Question · Medium
Read the clue and guess the term in 6 tries.
Game
Streeter-Phelps DO sag curve
Water Resources
A water quality test has a 5% false-positive rate. If five independent samples are analyzed and the true value is below detection, what is the probability that at least one sample reports a false positive?
Measure of location that has half the data smaller than it and half larger.
Probability and statistics
Lead concentrations in drinking water are log-normally distributed. Which transformation should be applied before computing a 95th percentile assuming a normal distribution?
Monod growth kinetics
Using the trapezoidal rule with two equal intervals, estimate the integral of f(x) from x = 0 to x = 4 if f(0) = 2, f(2) = 5, f(4) = 11.
Official mark, separate from the signature, placed on final engineering documents to certify responsible charge.
Ethics and professional practice
Calculus & Differential Equations
Daily flows to a wastewater plant are approximately normal with mean 12.0 MGD and standard deviation 1.5 MGD. What is the probability that flow on a randomly chosen day exceeds 14.0 MGD?
Swap tiles to line up three of the same term.
Term Match
Henry's law (air-water partitioning)
Solve dC/dt = -kC for C(t) given C(0) = C0.
Kind of cost that has already been incurred and cannot be readily recovered by a program.
Engineering economics
Chloride concentration in a river was measured monthly for one year. Which statistic best describes the typical concentration when one extreme outlier is present?
pH and alkalinity
A Poisson process produces an average of 3 fish kills per decade in a watershed. What is the probability of exactly 5 fish kills in the next decade?
Question · Hard
Electrode where oxidation occurs and electrons are generated in an electrochemical cell.
Fundamental principles
Probability, Statistics & Regression
Under the NCEES Model Rules, an engineer who discovers that a colleague's design poses a clear risk of harm to the public must FIRST do which of the following?
Ethics Professional Practice
Flip two cards at a time to find matching terms.
Term Pairs
CT disinfection concept
Water & Wastewater Engineering
An environmental engineer is offered a paid evaluation of equipment manufactured by her brother-in-law. According to the NCEES Model Rules, she must:
Five-day, 20 degrees C test that measures the organic matter broken down by microorganisms in a water sample.
Environmental chemistry
An EI (engineer intern) is asked to seal a discharge permit drawing prepared under a licensed PE's direction. Which response is ethically correct?
Activated sludge SRT vs F:M
An engineer is told by the client to omit a contaminant detection from a Phase II environmental site assessment because 'it would scare buyers.' The engineer should:
Legally enforceable cap on the maximum daily concentration of a workplace substance over a working lifetime without adverse health effects.
Health hazards and risk
Numerical Methods & Engineering Math
Continuing-education (CE) requirements vary by state, but most jurisdictions require licensees to complete which approximate amount of professional development each renewal cycle?
Find five hidden terms in a grid of letters.
Term Search
Clarifier surface overflow rate (SOR)
Which document is the canonical reference for the NCEES rules of professional conduct cited on the FE exam?
___-Weisbach equation is a normal-flow relationship whose nondimensional friction factor depends on Reynolds number and relative roughness.
Fluid mechanics
A capital project costs $500,000 today and saves $80,000/year for 10 years with i = 6%. The capital recovery factor (A/P, 6%, 10) ≈ 0.1359. What is the net annual worth of the project?
Engineering Economics
Hardness (water chemistry)
What is the present worth of $1,000 received 5 years from now if i = 8%? (P/F, 8%, 5) ≈ 0.6806.
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