Stats Midterm Ch 5

Front 1

the range is an _____measure of variability becasue it may be affected by one deviant score

Back 1

unstable

Front 2

the sum of all deviation in a sample e(x-x) always equals

Back 2

zero

Front 3

the standard deviation is a measure of the_____of how much scores in a distribution differ from the mean

Back 3

average

Front 4

a sample of scores have -x =65 and s=5. of you predict that a score in the distribution is 65, by how much will your prediction be in error

Back 4

5

Front 5

which measure is used in statistical hypothesis testing , the standard deviation or the variance ?

Back 5

variance

Front 6

the second step when calulation a variance is to _____the deviations from the mean

Back 6

square

Front 7

the term refers to how much scores differ from each other an from a measure of central tendency

Back 7

variability

Front 8

the measure of variability that is most used for inference is the ____ _____ standard deviation

Back 8

estimated population

Front 9

what measure of variability is found by subtracting the lowest score in a distribution from the highest

Back 9

range

Front 10

the symbol o2 represents _____variance

Back 10

population

Front 11

when the sample mean is subtracted from any score (x-_x) the result is called a

Back 11

deviation

Front 12

in a sample with _x =65 and s=5, a score that is within one standard deviation of the mean will be between 60 and ___

Back 12

70

Front 13

the estimated population standard deviation (s) is the _____ ____ of the estimated population variance (s2)

Back 13

square route

Front 14

which measure of variability should be used if a distribution is symmetrical and on a ratio or interval scale ?

Back 14

standard deviation

Front 15

if s=0 then all the scores in the distribution are

Back 15

equal