Ch. 5

For a sample of n= 30 scores, X = 45 corresponds to z = 1.50 and X = 40 corresponds to z = +1.00. What are the values for the sample mean and standard deviation? +0.25 +0.75 +1.25 +1.50

+1.50

If an entire population with μ= 60 and σ = 8 is transformed into z-scores, then the distribution of z-scores will have a mean of ___ and a standard deviation of ___. 0; 8 60; 1 0; 1 60; 8 (unchanged)

0; 1

A population of scores has µ= 44. In this population, a score of X = 40 corresponds to z = -0.50. What is the population standard deviation? 4 -8 2 8

8

For any distribution, what is the z-score corresponding to the median? Cannot be determined from the information given 1 N 0

0

A population distribution has σ = 6. What position in this distribution is identified by a z-score of z = +2.00? 2 points below the mean 12 points above the mean 2 points above the mean 12 points below the mean

12 points above the mean

A sample of n= 20 scores is transformed into z-scores. What is the value of SS, the sum of squared deviations, for the set of 20 z-scores? 0 20 19 Cannot be determined without more information

19

For a sample with M = 50 and s = 12, what is the X value corresponding to z = -0.25? 46 47 54 53

47

What position in the distribution corresponds to a z-score of z = -1.00? Below the mean by 1 point Below the mean by a distance equal to 1 standard deviation Above the mean by a distance equal to 1 standard deviation Above the mean by 1 point

Below the mean by a distance equal to 1 standard deviation

For a sample of n= 30 scores, X = 45 corresponds to z = 1.50 and X = 40 corresponds to z = +1.00. What are the values for the sample mean and standard deviation? M = 35 and s = 10 M = 35 and s = 15 M = 30 and s = 15 M = 30 and s = 10

M = 30 and s = 10

Which of the following z-score values represents the location farthest from the mean? z = +1.00 z = +0.50 z = -1.00 z = -2.00

z = -2.00