Chapter 5 Quiz
Any individual with a positive z-score has a score greater than the mean. a. True b. False
a
For a population with µ = 100 and σ = 20, what is the X value corresponding to z = -0.75? a. 85 b. 95 c. 105 d. 115
a
If an entire population with μ = 60 and s = 8 is transformed into z-scores, then the distribution of z-scores will have a mean of ____ and a standard deviation of ____. a. 0 and 1 b. 60 and 1 c. 0 and 8 d. 60 and 8 (unchanged)
a
If two individuals in the same population have identical X scores, they also will have identical z - scores. a. True b. False
a
Using z-scores, a population with µ = 37 and s = 6 is standardized so that the new mean is µ = 50 and s = 10. After the standardization, one individual has a score of X = 55. What was this individual's score in the original distribution? a. X = 40 b. X = 42 c. X = 43 d. It cannot be determined with the information given.
a
A population with µ = 85 and s = 12 is transformed into z-scores. After the transformation, what is the standard deviation for the population of z-scores? a. s= 12 b. s= 1.00 c. s= 0 d. s= 4.
b
For a population with a standard deviation of σ = 6, what is the z-score corresponding to a score that is 12 points above the mean? a. z = 1 b. z = 2 c. z = 6 d. z = 12
b
In N = 25 games last season, the college basketball team averaged µ = 76 points with a standard deviation of σ = 6. In their final game of the season, the team scored 89 points. Based on this information, the number of points scored in the final game was ____. a. a little above average b. far above average c. above average, but it is impossible to describe how much above average d. impossible to determine because there is not enough information to compare last year with the average
b
A population distribution has σ = 6. What position in this distribution is identified by a z-score of z = +2.00? a. two points above the mean b. two points below the mean c. twelve points above the mean d. twelve points below the mean
c
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? a. 2 b. 4 c. 8 d. -8
c
A sample has M = 72 and s = 4. In this sample, what is the X value corresponding to z = -2.00? a. X = 70 b. X = 68 c. X = 64 d. X = 60
c
In a population with σ = 8, a score of X = 44 corresponds to a z-score of z = -0.50. What is the population mean? a. μ = 36 b. μ = 40 c. μ = 48 d. μ = 52
c
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? a. M = 35 and s = 10 b. M = 30 and s = 15 c. M = 35 and s = 15 d. M = 30 and s = 10
d
On an exam with μ = 52, you have a score of X = 44. Which of the following values for the standard deviation would give you the highest position in the class distribution? a. σ = 2 b. σ = 4 c. σ = 8 d. σ = 10
d
The direct, unchanged scores that are the direct result of measurement are called: a. standardized scores b. deviation scores c. z-scores d. raw scores
d