PSY 230 - Chapter 4
In a population of N = 5 scores, the first four scores each have a deviation of +2. What is the deviation for the fifth score?
-8
For a population that has a mean of µ = 24 with a standard deviation of σ = 4 and N = 10, what is the value for ∑(X - µ)?
0
What is the variance for the following population? Scores: 5,5,5,5
0
On an exam with a mean of µ = 70, you have a score of X = 75. Which value for the standard deviation would give you the highest position within the class?
1
The following population has a mean of μ = 5. What is the standard deviation for this population? Scores: 4, 4, 6, 6
1
A population of scores has µ = 20 and σ = 5. If two points are added to every score in the population, then the new values for the mean and standard deviation would be _____.
µ = 22 and σ = 5
A population of scores has µ = 20 and σ = 5. If every score in the population is multiplied by 2, then the new values for the mean and standard deviation would be _____.
µ = 40 and σ = 10
For a particular sample, the largest distance (deviation) between a score and the mean is 11 points. The smallest distance between a score and the mean is 4 points. Therefore, the standard deviation _____.
is probably between 4 and 11
The symbol SS stands for the ______.
the sum of squared deviations
For a sample of n = 10 scores, how many scores are used to compute the range?
2
For a sample of n = 8 scores, the sum of the squared deviations is 50. If these same scores were a population, then what value would be obtained for the sum of squared deviations for the population?
50
To compute population variance, the sum of the squared deviations (SS) is divided by ____.
N
For the following sample, what would happen to the range is the score of X = 2 were changed to X = 9? Scores: 1, 1, 2, 5, 7, 10
The range would not be changed
For a sample of n = 10 scores, how many scores are used to compute the standard deviation?
all 10
The population standard deviation is identified by a lowercase Greek sigma (σ). What symbol is used to identify the standard deviation for a sample?
s
The variability of the scores in a sample tends to be _______ the variability of the scores in the population from which the sample was obtained.
smaller than
