stats week 3

What is the value of SS (sum of squared deviations) for the following population? Population: 1, 1, 1, 5

12

In a population of N = 10 scores, the smallest score is X = 8 and the largest score is X = 20. What is the range for this population.

12-13

A population of N = 5 scores has ∑X² = 100. For this population, what is the value of SS?

20

A population of N = 6 scores has ∑X = 12 and ∑X² = 54. What is the value of SS for this population?

30

The sum of the squared deviation scores is SS = 20 for a sample of n = 5 scores. What is the variance for this sample?

5

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

9

What are the values for SS and variance for the following sample of n = 3 scores? Sample: 1, 4, 7

SS=18 Variance=9

T of F:For a population of scores, the sum of the deviation scores is equal to N.

false

T or F: For a population with μ = 70 and σ = 5, about 95% of the individuals will have scores between X = 65 and X= 75.

false

T or F:A sample of SS = 40 and a variance of 8 has n = 5 scores

false

T or F:A sample of n = 7 scores has SS = 42. The variance for this sample is s² = 6.

false

Which symbols identifies the sample variance?

s^2

For the following scores, which of the following actions will increase the range? Scores: 3, 7, 10, 15

subtract 3 points from x=3

T of F: For a population, a deviation score is computed as X - μ.

true

T or F: If you have a score of X = 66 on an exam with μ = 70, you should expect a better grade if σ = 10 than if σ = 5.

true

T or F: It is easier to see the mean difference between two samples if the sample variances are small.

true

T or F:For a sample with M = 40 and s = 4, about 95% of the individuals will have scores between X = 32 and X = 48.

true

T or F: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

T or F:The range and standard deviation are both measures of distance

true

A population of μ = 50 and σ = 5. If 10 points are added to every score in the population, what are the new values for the mean and standard deviation?

μ=60 σ=5