Ch. 6 Understanding Raw Scores Flashcards
three measures of central tendency
Mean, median, and mode
range and standard deviation are the most frequently used of the various measures of …
variability
What is standard deviation and what does a larger value of standard deviation mean?
average deviation from the mean; a larger SD means greater variability
For a normal curve, all 3 measures of central tendency are …
equal
“A person scoring 2 standard deviations below the mean falls at the _____ percentile
second
A person scoring at 1 standard deviation below scores at the ______ percentile
16th
A person scoring at the median or mean is at the _____ percentile
50th
a person scoring 1 standard deviation above the mean is at the _____percentile
84th
a person scoring 2 standard deviations above the mean is at the _____ percentile
98th
skewness
the degree and direction to which a distribution is asymmetrical.
two types of skew:
negative and positive
a sixth grader obtaining a grade equivalent score of 9.3 in arithmetic means …
the student obtained a score on the arithmetic test equal to the score the average ninth grader would have obtained on that test in the unlikely event a ninth grader were to take a sixth grade level test.
percentile scores
scores reported in terms of of the percentage of test-takers who scored lower than the test-taker’s score
standard score
score expressed as a distance between the raw score and the mean expressed in SD units
Z score is a …
standard score, allows us to estimate where a raw score would fall on a normal curve
