QUESTION 7Which of the following is not a characteristic of the chi-square distribution? Select all correct answers.

The mean of the chi-square distribution is located to the left of the peak.

The chi-square curve is nonsymmetrical.

The 2 curve approaches, but never touches, the positive horizontal axis.

As the degrees of freedom increases, the chi-square curves look more and more like a normal curve

QUESTION 7 Which of the following is not a characteristic of the chi-square distribution? Select all correct answers. The mean of the chi-square distribution is located to the left of the peak. The chi-square curve is nonsymmetrical. The 2 curve approaches, but never touches, the positive horizontal axis. As the degrees of freedom increases, the chi-square curves look more and more like a normal curve

QUESTION 12 . 1 POINT Which of the following is not a characteristic of the chi-square distribution? Select all correct answers. Select all that apply: The mean of the chi-square distribution is located to the left of the peak. The chi-square curve is nonsymmetrical. The x' curve approaches, but never touches, the positive horizontal axis. As the degrees of freedom increases, the chi-square curves look more and more like a normal curve. FEEDBIn which of the following situations should the chi-square test for goodness-of-fit be used? Select the correct answer below: An online research company puts out a survey asking people two questions. First, it asks whether they buy groceries online. Second, it asks whether they own a car or not. The data are collected and recorded in a contingency table. The company wants to determine if there is a relationship between buying groceries online and car ownership. O A researcher is trying to determine if the amount of time children spend watching television has the same distribution for boys and for girls. She surveys a random sample of families and records the distribution of time spent watching television for each gender. She wants to determine if the distributions are the same. O A professor is trying to decide if her students randomly guessed on a certain multiple choice question or if they had some idea of the correct answer. She records the number of students who answered with each answer choice and compares this distribution with a uniform distribution, which is what she would expect if everyone L had guessed.The Dirac delta function in three dimensions can be taken as the improper limit as a -0 of the Gaussian function 1 D(a; x, y, z) = (21) 3/20 3 exp 202 ( 12 + 12 + 2 2 ) Consider a general orthogonal coordinate system specified by the surfaces u = constant, v = constant, w = constant, with length elements du/U, do/V, dw/W in the three perpendicular directions. Show that 6(x - x') = 8(u - u') 8(v - v') 8(w - w') . UVW by considering the limit of the Gaussian above. Note that as a - 0 only the infin- itesimal length element need be used for the distance between the points in the exponent