Stats test 2

for a population with M=80 and O=6, what is the z-score corresponding with X=68?

-2.00

A population has SS=100 and 02=4. What is the value of E(X-M) for the population?

0

For any distribution, what is the z-score corresponding to the mean?

0

a sample of n= 20 scores is transformed into z-scores. What is the mean for the set of 20 z-scores?

0

if an entire population with M=60 and O=8 is transformed into z-scores, then the distribution of z-scores will have a mean of ___ and a standard deviation of ____.

0;1

A population of N=100 scores has M=30 and O=4. What is the population variance?

16

A population has SS= 100 and o2=4. How many scores are in this population?

25

what is the value of SS for the following sample? Sample: 1,1,1,7

27

A population of scores has M=80. In this population, a score of X=86 corresponds to Z= +2.00. What is the population standard deviation?

3

in a population with a standard deviation of O=5, a score of X=44 corresponds to a z score of z=2.00. what is the population mean?

34

a sample of n=5 scores has EX=20 and EX2= 120. For this sample, what is the value of SS?

40

A sample of n=8 scores has SS=50. if these same scores were a population, then the SS value for the population would be ____.

50

What position in the distribution corresponds to a z-score of z = -1.00?

Below the mean by a distance equal to 1 standard deviation.

A population has M=50 and O=5. if 10 points are added to every score in the population, what are the new values for the mean and standard deviation?

M=60 and O=5

for a sample with s= 12, a score of X= 73 corresponds to z= -1.00. What is the sample mean?

M=85

A sample of n=9 scores has a variance of s2=18. if the scores were a population, what value would be obtained for the population variance.

O2=16

A population has M=50. What value of O would make X=55 an extreme value out in the tail of the distribution?

O=1

on an exam with a mean of M=70 , you have a score of X= 65. which of the following values for the standard deviation would give you the highest position in the class?

O=10

on an exam with M= 52, you have a score of X=44. Which value for the Standard deviation would give you the highest position in the class distribution?

O=8

What are the values for SS and variance for the following smaple of N=3 scores? Sample 1,4,7.

SS= 18 and variance= 9

For the following scores, which of the following actions will increase the range? Scores: 3,7,10,15

Subtract 3 points from the score X=3.

Which of the following actions will have no effect on the value of the standard deviation?

Subtract 5 points from every score in the distribution

which of the following is a consequence of increasing variability?

The distance from one score to another tends to increase, and a single score tends to provide a less accurate representation of the entire distribution.

under what circumstances is a score that is 15 points above the mean an extreme score relatively far from the mean?

When the population standard deviation is much smaller than 15

which of the following z-score values represents the location farthest from the mean?

Z= -2.00

Which of the following symbols identifies the population standard deviation?

o symbol thing

Which of the following symbols identifies the sample variance?

s2

A set of 10 scores has SS=90. if the scores are a sample the sample variance is ____. and if the scores are a population, the population variance is ____.

s2=10 O2=9

A sample has M= 72 and s=4. in this sample, what is the X value corresponding to z = -2.00?

x=64

for a population with a standard deviation of O=6, what is the z-score corresponding to a score that is 12 points above the mean?

z=2

What is the value of SS for the following population? Population 1, 1, 1, 5

12