Question:

In the article by Gadd and Phipps (2012), they refer to the challenges faced by psychological and, specifically, neuropsychological assessment. Their study focused on a preliminary standardisation of the Wisconsin Card Sorting Test (a non-verbal measure) for Setswana-speaking university students. The US normative sample is described as participants (N = 899) from both genders who were screened beforehand to exclude individuals with a history of neurological, learning, emotional and attention difficulties. The South African sample consisted of university students (N = 93) from both genders, between the ages of 18 and 29, who were screened in terms of hearing and visual impairments and any history of psychiatriceurological difficulties. The latter was done to prevent contamination of the results by these variables. The students were from the University of Limpopo, Medunsa Campus. Answer Questions 1 to 5.

Question 5

Gadd and Phipps (2012) found that the results of the South African sample on the Wisconsin Card Sorting Test did not resemble a normal distribution and could not be converted to a normal distribution. This implies that the ...

(1) mean performance of this sample cannot be calculated

(2) standard deviation will differ below and above the mean

(3) mean and standard deviation do not provide a predetermined distribution of performance

(4) results cannot be replicated

Would 1 be the correct answer?

Charged boop (with Barling R on an axis through the center a distance z away): Force AL--disc with Radius R on an axis through the renter a Newto Name: Electric field of a sphere [5 points] Charge is distributed throughout a sphere of radius R according to the formula: p(r) - Po (1 - R) R where r is the distance from the center of the sphere. This sphere is shown at the right. Two gaussian surfaces are drawn in the figure, one with radius r R. a. Determine the charge enclosed by the inner gaussian surface (with radius ri). b. Write an algebraic expression for the electric field at the surface of the inner gaussian surface (with radius 71). c. Determine the charge enclosed by the outer gaussian surface (with radius ry). d. Write an algebraic expression for the electric field at the surface of the outer gaussian surface (with radius ra). Continued on next pageQuestion 2. (E) The previous question helped you work out the mechanics of various Gaussian elimination variants. In this question, we see the application. Consider the following system of equations 61 + 202 + 2.13 = -2. 2n + =1+= =1, 1 3 $1 + 212 - 13 =0. (a) Find the true solution to the above system. (You may use Naive Gaussian elimination with exact arithmetic, or use computer software.) (b) Use Naive Gaussian elimination and floating point arithmetic (with rounding and four digits in the significand) to compute the solution of the system of equations. How does it compare to the true solution? (c) Use Gaussian elimination with partial pivoting in floating point arithmetic (with rounding and four digits in the significand) to compute the solution to the same system. How does it compare to the true solution, and to the solution obtained in part (b)? Make sure to clearly show all your steps, including any row/column exchanges and index/scaling vectors.Question 1. Find the solution to the following system of equations r + 2y + 2 = 1 3r + 7y + 32 =1 -2c - 31 -42 =1 using (a) (2 points) Naive Gaussian elimination, (b) (3 points) Gaussian elimination with partial pivoting, (c) (4 points) Gaussian elimination with complete pivoting, and (d) (4 points) Gaussian elimination with scaled partial pivoting. Make sure to clearly show all your steps, including any row/column exchanges and index/scaling vectors