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Time left 0:47:21Question 11Not yet answeredMarked out of 1Flag questionTipsQuestion textQuestionFacility IndexDiscrimination Index120.80.4250.50.3320.70.6400.40.3Which one of the questions, based on the indices, is BEST suited to be included in a revised version of the test?Question 11Answera.25b.40c.32d.12Clear my choiceQuestion 12Not yet answeredMarked out of 1Flag questionTipsQuestion textThe scatter diagram shows scores of 10 students on Mathematics and Science. The correlation between Mathematics and Science can be described asQuestion 12Answera.strongly positiveb.weak positivec.strongly negatived.weak negativeClear my choiceQuestion 13Not yet answeredMarked out of 1Flag questionTipsQuestion textMs. George obtained a reliability index of -.85 for her two English tests. Which of the following is a possible cause for the reliability index?         i. High scores were obtained for the first test and high scores for the second test.      ii. High scores were obtained for the first test and low scores for the second test.     iii. Low scores were obtained for the first test and low scores for the second test.Question 13Answera.ii onlyb.i onlyc.i, ii and iiid.i and ii onlyClear my choiceQuestion 14Not yet answeredMarked out of 1Flag questionTipsQuestion textAfter comparing two sets of scores, a correlation coefficient of zero was obtained. This indicates that  Question 14Answera.the variables are independent of each other  b.there is a strong positive relationship between the two variables.c. there is a strong negative relationship between the two variables.d.there is no linear relationship between the two variables

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Time left 0:47:21Question 11Not yet answeredMarked out of 1Flag questionTipsQuestion textQuestionFacility IndexDiscrimination Index120.80.4250.50.3320.70.6400.40.3Which one of the questions, based on the indices, is BEST suited to be included in a revised version of the test?Question 11Answera.25b.40c.32d.12Clear my choiceQuestion 12Not yet answeredMarked out of 1Flag questionTipsQuestion textThe scatter diagram shows scores of 10 students on Mathematics and Science. The correlation between Mathematics and Science can be described asQuestion 12Answera.strongly positiveb.weak positivec.strongly negatived.weak negativeClear my choiceQuestion 13Not yet answeredMarked out of 1Flag questionTipsQuestion textMs. George obtained a reliability index of -.85 for her two English tests. Which of the following is a possible cause for the reliability index?         i. High scores were obtained for the first test and high scores for the second test.      ii. High scores were obtained for the first test and low scores for the second test.     iii. Low scores were obtained for the first test and low scores for the second test.Question 13Answera.ii onlyb.i onlyc.i, ii and iiid.i and ii onlyClear my choiceQuestion 14Not yet answeredMarked out of 1Flag questionTipsQuestion textAfter comparing two sets of scores, a correlation coefficient of zero was obtained. This indicates that  Question 14Answera.the variables are independent of each other  b.there is a strong positive relationship between the two variables.c. there is a strong negative relationship between the two variables.d.there is no linear relationship between the two variables

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Solution

Question 11: The best question to include in a revised version of the test, based on the indices, would be the one with the highest Facility Index and Discrimination Index. The Facility Index measures the proportion of students who answered the question correctly, while the Discrimination Index measures how well the question differentiates between high and low scorers. Therefore, the answer is c.32, as it has the highest values for both indices.

Question 12: Without the scatter diagram, it's impossible to determine the correlation between Mathematics and Science scores.

Question 13: A reliability index of -0.85 indicates a strong negative relationship between the scores on the two English tests. This could be caused by high scores on the first test and low scores on the second test. Therefore, the answer is a.ii only.

Question 14: A correlation coefficient of zero indicates that there is no linear relationship between the two sets of scores. Therefore, the answer is d.there is no linear relationship between the two variables.

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