The _____ is the score in a distribution which has half of the scores above it and half of the scores below it.

Quesiton : The _____ is the score in a distribution which has half of the scores above it and half of the scores below it.

Answer: Median

The _____ is the score in a distribution which has half of the scores above it and half of the scores below it. Percentage of scores falling at or below a specific score . A percentile rank of 95 means that 95 % of all of the scores fall at or below this point. In other words the score is as good as or better than 95 % of the scores . The most frequently occurring scores (s) in a distribution . Mean. The arithmetic average of a distribution obtained by adding the scores and then dividing by the number of scores . Median. The middle score in a distribution ; half the scores are above it and half are below it. Median – middle score in distribution - Half the scores are above it & half are below it Measure of Variation Variation – how similar or diverse scores are -AVGs derived from scores w/ low variability are more reliable than AVGs based on scores w/ high variability Range – difference b/w highest & lowest scores in distribution Standard Deviation – computed measure of how much scores vary ... A Z score is a number of standard deviations a score is above or below the mean. In the Standard Normal Distribution the mean is always equal to 0 and the standard deviation is equal to 1.0. The Z scores help us to describe various aspects of the distribution such as percentile ranks percentages of scores between points etc. (T scores are not related to the t-test that will be discussed later). 29 Z-Scores The z score is a type of standard score that indicates how many standard deviation units a given score is above or below the mean for that group. The z scores create a scale with a mean of 0 and a standard deviation of 1. The shape of the z score distribution is the same as that of the raw scores used to calculate the z scores . For example: a Z- score of 1.0 is one standard deviation above the mean; a Z- score of -2.5 is two and a half standard deviations below the mean. A Z- score of 0 will represent the mean of the distribution . What proportion of a normal distribution falls above a z- score of 1.16? ... about percent of the scores fall above a z score of 300? ... distribution half (50%) of the distribution falls below (to ... In a normal distribution what is the z score : a. above which the top 5% of cases fall? b. above which the top 1% of cases fall? c. below which the bottom 5% of the cases fall? d. below which the bottom 75% of the cases fall? X-bar=20 and S=5 on a test of mathematics problem solving ( scores reflect the number of problems solved correctly.) Therefore half the scores in the distribution fall above the mean and half fall below the mean. If the mean of a normal distribution equals 75 the median and mode also equal 75. · The proportion of area in any section of the curve represents the proportion of scores in the same section of the curve. lets say we have a mean of 35 on a test and a s.d. of 8. We can say that at a score of 43 or one s.d. above the mean 84% of the students scored at that level or below. Or if we subtract and get a . score of 27 or one s.d. below the mean we would report 16% of the students scored at or below this level. A bell shaped curve is associated with a normal curve. It represents most scores being in the middle of the …