Math 221 - Study guides, Class notes & Summaries

What is a matrix of coefficients? Correct Answer The matrix formed of all the coefficients of one or more sums of variables with coefficients. What is an augmented matrix? Correct Answer The matrix formed of all the coefficients and values of one or more linear equations. What is row echelon form? Correct Answer When each leading entry is to the right of those above it, and any rows of zeros are at the bottom. What is reduced row echelon form? Correct Answer When all leading entries are...

MATH 221 Quiz Week 7 : DeVry University, New York - Worth 60 Points.

A random number generator is used to select a number from 1 to 100. What is the probability of selecting an even number? Correct Answer 0.50 What is the sample space of rolling two four-sided die? Correct Answer (1,2)(1,3)(1,4)(2,2)(2,3)(2,4)(3,4)(4,4) Consider the table below Response (number of cats owned); None One, Two, Three, Four or more Frequency; 659, 329, 52, 13, or 8 What is the probability that the next person asked has four or more cats? Correct Answer Less than 1% Consid...

What is the intersection of sets Correct Answer elements common to both A and B What is the union of sets Correct Answer all elements in A or B What is a complement of a set Correct Answer all elements given in the universal set that are not in A What is the relative complement of a set Correct Answer all elements in B that are not in A Linear function definition Correct Answer increases by a constant value of one common difference Geometric function definition Correct Answer mult...

The City of Rexburg reports that the nitrate concentration in the city's drinking water supply is between 1.59 and 2.52 ppm (parts per million,) and values outside of this range are unusual. We will assume μ−2σ=1.59 ppm and μ+2σ=2.52 ppm. It is reasonable to assume the measured nitrate concentration is normally distributed. Estimate the mean of the measured nitrate concentration in Rexburg's drinking water.(1.59+2.52)/2= 4.11/2= 2.055 Curvature Residual PlotIf the residual plot ...

Math 221 Quiz Week 1 to Week 7 Combined Quizzes with complete solution

Secant Line Correct Answer The line connecting any two points on a curve. Tangent Line Correct Answer The line that best approximates a function near a point A. It's the limit of secant lines connecting points A & B as B approaches A. Squeeze Theorem Correct Answer If f(x)≤g(x)≤h(x) and if the top and bottom functions both have the same limits, we can conclude that the middle function must have the same limit. Continuity Correct Answer A function, f, is continuous at x=a if the lim...

d/dx (log b X) Correct Answer 1/ (X ln(b)) d/dx (a^x) Correct Answer a^x (ln a ) d/dx (tan x) Correct Answer sec^2x d/dx (cot x) Correct Answer -csc^2 x d/dx (csc x) Correct Answer -csc x * cot x d/dx (sec x) Correct Answer sec x * tan x d/dx (arctan x) (TEST) Correct Answer 1/(x^2 + 1) d/dx (arcsin x) (TEST) Correct Answer 1/ (sqrt (1- x^2)) d/dx (arcsec x) (TEST) Correct Answer 1/ (sqrt (x( x^2- 1))) d/dx (sinh x) (TEST) Correct Answer cosh x d/dx (cosh x) (TEST) ...

Question 1 2 / 2 pts (CO 1) A survey of 128 DeVry statistics students found that 83% read the announcements each week. What is the population and what is the sample? Population: DeVry statistics students; Sample: the 83% that read the announcements weekly Population: all statistics students reading announcements weekly; Sample: the 128 DeVry statistics students Population: all statistics students; Sample: 128 DeVry statistics students Correct! Population: DeVr...

From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 21.69 with a population standard deviation of 3.23. What is the 95% confidence interval for the amount of time spent on administrative issues? A. (19.24, 24.14) B. (21.78, 22.60) C. (20.86, 22.52) D. (20.71, 22.67) - ANSWER-C. (20.86, 22.52) If a confidence interval is given from 45.82 up to 55.90 and the mean is known to be 50.86, what is the margin of error? 2.52...