LU Tests and Measurements Final Exam Study Guide flashcards | Quizlet

# Approximately what percentage of cases falls between

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Approximately what percentage of cases falls between a z-score of +2 and a z- score of +3? 2% For making predictions, a test that yields a large negative correlation is as useful as one with the same sized positive correlation In high school, a teacher gave two sections of a class the same arithmetic test. The results were as follows: Section I: Mean 45, SD 6.5; Section II: Mean 45, SD 3.1. Which of the following conclusions is correct? Section I is more variable than Section II. What percentage of students in a distribution falls between the first and third quartiles? 50% The distance between -.50 and +.50 in z- score units represents how many stanines? ... The coefficient of determination is used to compare the relative strength of coefficients 90 normally distributed test scores; mean of 70; SD of 10. A T-score of zero (0) would be equivalent to a raw score of 20 The result of computing a linear correlation coefficient when a somewhat curvilinear relationship exists will be a(n) underestimation of the relationsship The score that is duplicated (repeated) the largest number of times in a set of scores is the mode The distribution below is (distribution has the hump on the left side) positively skewed

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In a normal distribution, approximately what percentage of scores lies between T-scores of 40-80? 84% Given the following distribution of scores, which value most accurately represents the median? 83,71,98,83,83,93,87,83,64,83 ... An r-value of +0.82 can be interpreted to mean that the two variables tend to be closely related The median is a point on the scale that divides the number of scores in halves In a frequency distribution of 290 scores, the mean is 99 and the median is 86. One would expect this distribution to be positively skewed Assume that a set of 90 normally distributed test scores has a mean of 70 and a standard deviation of 10. A percentile of 50 would equal a raw score on the test of ... In a negatively skewed distribution this value is located at the lower end the items refers to the mean Which of the following correlation coefficients indicates the highest degree of linear relationship? .87 If the correlation between piano playing ability and proficiency in weight lifting is negative, we would know that if John is a poor piano player, he would likely be a good weight lifter One of the disadvantages of a grouped frequency distribution is that it loses information about individual scores Given the following distribution of scores, which value most accurately represents the median? 7,3,8,7,7,10 ... The most dependable derived unit for measuring how far score varies from the mean for the group is called the standard deviation
A pupils reading achievement score is one standard deviation above the national norm. How could you best interpret this finding to her parents? she is above average in reading An individual reported a correlation of 1.25 between form A and form B of an intelligence test. From this coefficient one would conclude that a mistake has been made in computing the correlation coefficient Eliminating scores near the middle of a distribution cannot effect this statistic ...

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