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