Statistics for Psychology Lecture 7

A population has SS = 100 and σ2 = 4. What is the value of Σ (X - μ ) for the population?

0

A sample consists of n = 16 scores. How many of the scores are used to calculate the range?

2

A population of N = 10 scores has a standard deviation of σ = 2. What is the value of SS, the sum of the squared deviations, for this population?

40

What is the value of SS for the following set of scores? Scores: 0, 1, 4, 5

Cannot answer without knowing whether it is a sample or a population.

​If a sample of n = 6 scores has Σ X = 30 and Σ X 2 = 200, then SS = 20.

False

What is the value of SS (sum of squared deviations) for the following population? Population: 2, 3, 0, 5

SS= 13

A population of N = 6 scores has ΣX = 12 and ΣX2 = 54. What is the value of SS for this population?

SS= 30

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

For a population, a deviation score is computed as X - μ.

True

If the scores in a population range from a low of X = 5 to a high of X = 14, then the population standard deviation must be less than 10 points

True

The range and the standard deviation are both measures of distance.

True

Which of the following symbols identifies the sample variance? a.​s b.​σ c.​s2 d.​σ2

c. s2

For a particular population, 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 _____.

will be between 4 and 11