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Common Error Assistance - Sample Assignment (Homework)

James Finch

Math - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 1 / 10

Due : Sunday, January 27, 2030 23:59 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6 7 8 9
0/2 0/1 0/1 0/1 0/1 0/1 0/1 1/1 0/1
Total
1/10 (10.0%)

  • Instructions

    This assignment provides examples of WebAssign’s Common Error Assistance. Common Error Assistance in WebAssign automatically assesses student responses for common format and syntax errors to provide helpful assistance right within the question, without giving the answer away. The student's error is quickly identified which helps them stay focused and engaged in learning the material.

    Each question provides specific instructions with suggestions of the different values you can submit to see examples of Common Error Assistance.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. 0/2 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1 2
0/1 0/1
13/100 63/100
Total
0/2
 
  • This problem displays feedback for questions that involve rounding.

  • The exact answer is 30.4795013082563, and the question specifies to round to one decimal place.
  • In the numerical answer blank, try 30.
  • Try 30.4.
  • Try -30.5. (Note: It is unlikely that students will enter a negative answer for this question, but a sign error can be a common mistake in questions involving downward velocity and speed.)
A furniture store offers free setup and delivery services to all points within a 35 mi radius of its warehouse distribution center. If you live 20 mi east and 23 mi south of the warehouse, will you incur a delivery charge?
     Incorrect: Your answer is incorrect.
Justify your answer by finding the total distance between the warehouse and your house. (Round your answer to one decimal place.)
Incorrect: Your answer is incorrect. seenKey

30.5

 mi
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2. 0/1 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1
0/1
22/100
Total
0/1
 
  • This question displays feedback for questions with a numerical answer that asks for an exact answer.

  • To be consistent with the pedagogy of the corresponding textbook section, only exact answers are accepted; rounded decimal answers are rejected.
  • Try 0.111.
  • Try 9/1.

  • For reference, the answer is computed as
     
    1/3
    0
     12x2(1 − x) dx.
The fraction of streets in the downtown section of a certain city that need repairs in a given year is a random variable with a distribution described by the probability density function
f(x) = 12x2(1 − x)    (0 ≤ x ≤ 1).
Find the probability that at most a third of the streets will need repairs in any given year.
Incorrect: Your answer is incorrect. seenKey

1/9
You entered the numerator and denominator in the opposite order.
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3. 0/1 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1
0/1
7/100
Total
0/1
 
  • This question displays feedback for some common errors that students make when entering a polynomial in algebraic mode: responding with the given expression, having an incorrect sign, or using the wrong variable.

  • Note: The following expressions can be copied and pasted into the answer field.
  • Try the given -t^3 + 2t^2 + 6t
  • Try -t(t^2 + 2t + 6) or any other plus/minus sign error.
  • Try -x(x^2 - 2x - 6)
An efficiency study conducted by Elektra Electronics showed that the number of Space Commander walkie-talkies assembled by the average worker t hr after starting work at 8 AM is
−t3 + 2t2 + 6t    (0 ≤ t ≤ 4)
Factor the expression.
−x(x2−2x−6)
Incorrect: Your answer is incorrect. webMathematica generated answer key
Check which variable(s) should be in your answer.
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4. 0/1 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1
0/1
9/100
Total
0/1
 
  • This question displays feedback for common errors that students make when entering a polynomial with exponents in algebraic mode.

  • Note: The following expressions can be copied and pasted into the answer field.
  • Try the given (2x+3)(4x-5)
  • Try 8X^2+2X-15 where X is capitalized.

  • Investigation into student response data revealed the following typos are common when entering polynomials. Feedback was authored for these general cases.
  • Try 8x2 + 2x - 15
  • Try 8x^2 2x - 15
  • Try 8^2 + 2x - 15
Perform the indicated operations and simplify the expression.
(2x + 3)(4x − 5)
8x2+2x−15
Incorrect: Your answer is incorrect. webMathematica generated answer key
You may have typed an exponent wrong. Use ^ for a superscript exponent.
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5. 0/1 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1
0/1
6/100
Total
0/1
 
  • This question displays feedback for errors made when an algebraic question requires simplification. Our simplification grading makes over two dozen checks for unsimplified expressions, and there is a corresponding rejoinder for each. The following responses correspond to a subset of these simplification cases and can be tested in this question.

  • Note: The following expressions can be copied and pasted into the answer field.
  • 4x^4 + 20x^3 + 6x^2 + 15x + 7 + 0
  • 4x^4 + 20x^3 + 6x^2 + 15x + 7/1
  • 4x^4 + 20x^3 + 6x^2 + 15x + 7x^0
  • 4x^4 + 20x^3 + 6x^2 + 15x^1 + 7
  • 4x^4 + 20x^3 + 6x^2 + 15x + 7* 1^5
  • 4x^4 + 20x^3 + 6x^2 + 15x + 7* (-1)^4
  • 4x^4 + 20x^3 + 6x^2 + 15x + 14/2
  • (2 + 2)x^4 + 20x^3 + 6x^2 + 15x + 7
  • 2x^4 + 2x^4 + 20x^3 + 6x^2 + 15x + 7
  • 2*2x^4 + 20x^3 + 6x^2 + 15x + 7
  • 2^2 x^4 + 20x^3 + 6x^2 + 15x + 7
  • 4x^4 - - 20x^3 + 6x^2 + 15x + 7
  • 2(2x^4 + 10x^3 + 3x^2) + 15x + 7
  • 4x^4 + 20x^3 + 6x^2 + (225x^2 - 49)/(15x - 7)
  • 4 x^4 + 20x^3 + 6x^2 + 15x + 7i^4
  • 4x^4 + (4 + 2i)(4 - 2i)x^3 + 6x^2 + 15x + 7
Simplify the following expression.
(2x4 + 10x3 + 3x2 + 10x + 7) + (2x4 + 10x3 + 3x2 + 5x)
4x4+20x3+6x2+(225x2−49)/(15x−7)
Incorrect: Your answer is incorrect. webMathematica generated answer key
Simplify rational expressions.
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6. 0/1 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1
0/1
8/100
Total
0/1
 
  • This question displays feedback for common errors made by students when entering an ordered comma-separated list. This example involves entering dimensions in a particular order.

  • Note: The following expressions can be copied and pasted into the answer field.
  • Try (4,4,6)
  • Try 4,6
  • Try 4,6,4
An open rectangular box is to have a volume of
96 ft3.
 If the material for its base costs three times as much (per square foot) as the material for its sides, what are the dimensions of the box that can be constructed at the minimum cost? (Let l represent the length in feet, w the width in feet, and h the height in feet.)
(l, w, h) = 
4,6,4
Incorrect: Your answer is incorrect. webMathematica generated answer key
The order and frequency of terms in the comma-separated list are important here.
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7. 0/1 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1
0/1
4/100
Total
0/1
 
  • This question displays feedback for common mistakes found in prime factorization questions: not factoring completely, factoring incorrectly, or entering an answer in an incorrect notation.

  • Note: The following expressions can be copied and pasted into the answer field.
  • Try 3*6
  • Try 3 * 2^2

  • Looking through student response data for prime factorization questions, the following common mistakes were discovered. Feedback was authored for these general cases.
  • 2,3,3
  • 1,2,3,6,9,18
Find the prime factorization of the number.
18
3·2·2·2
Incorrect: Your answer is incorrect. webMathematica generated answer key
Check your answer by multiplying.
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8. 1/1 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1
1/1
9/100
Total
1/1
 
  • This question displays basic feedback for questions in matrix mode. The feedback lets students know how many answer blanks they have correct or if the student has submitted a matrix with the incorrect dimension.

  • Try entering -2 in each cell.
  • Try changing the size of the matrix to 3x3 and entering 1 in each cell.
Use the following matrix.
D =
42
35
Write the negative of D.

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9. 0/1 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1
0/1
5/100
Total
0/1
 
  • This question displays feedback for common errors made in statistics questions that involve z-scores. This question also features Cengage's SALT tool. Click here for more information.

  • Try 14.34
  • Try .8565 corresponding to the area left of z = 1.06502.
  • Try 0.71312 correspond to the area between -1.06502 < z < 1.06502.
  • Try 0.28688 corresponding to the two tails z < -1.06502 and z > 1.06502.

  • For reference, the answer is approximated as Pr(z > (287.5 - 270)/sqrt(270)) = Pr(z > 1.06502) for the normal distribution.
A study was conducted relating particulate air pollution and daily mortality in Steubenville, Ohio.†Schwartz, J., & Dockery, D. W. (1992, January). Particulate air pollution and daily mortality in Steubenville, Ohio. American Journal of Epidemiology, 135(1), 12–19. On average over the past 10 years there have been 3 deaths per day in Steubenville. Suppose that on 90 high-pollution days—days in which the total suspended particulates are in the highest quartile among all days—the death rate is 3.2 deaths per day, or 288 deaths observed over the 90 high-pollution days.
A button hyperlink to the SALT program that reads: Use SALT.
Using the normal approximation to the Poisson distribution, what is the probability of 288 or more deaths on high-pollution days? (Round your answer to four decimal places.)
Incorrect: Your answer is incorrect. seenKey

0.1434
You may have found the complement of the desired probability.
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