1 points

1 points

QUESTION 3

• After a researcher adds 6 points to every score in a sample, the standard deviation is found to bes = 12. The original sample had a standard deviation ofs = 6.
• True
• False

1 points

1 points

QUESTION 5

• A Pearson correlation value ofr = -0.90 indicates that the data points are clustered far from a line that slopes down to the right.
• True
• False

1 points

QUESTION 6

• A population hasSS = 100 and² = 4. What is the value of (X -) for the population?

	a.	0
	b.	400
	c.	25
	d.	100

1 points

QUESTION 7

• A population distribution has = 6. What position in this distribution is identified by az-score ofz = +2.33?

	a.	14 points above the mean
	b.	8.33 points below the mean
	c.	8.33 points above the mean
	d.	12 points above the mean

1 points

QUESTION 8

• In a population ofN = 10 scores obtained for a discrete variable for which 0 is not a possible score, the smallest score isX = 8 and the largest isX = 20. What is the range for this population?

	a.	12
	b.	8
	c.	10
	d.	20

1 points

QUESTION 10

• In a sample with a mean ofM = 4 made up of four scores, two scores are free to vary and the third and fourth scores are fixed.
• True
• False

1 points

QUESTION 11

• For a distribution of scores, the location identified byz = +1.00 and the location identified byz = -1.00 are the same distance from the mean.
• True
• False

1 points

QUESTION 12

• Individuals that score typically to others in a population following a treatment will tend to have extremez-scores.
• True
• False

1 points

QUESTION 13

• For a population, a deviation score is computed asX -.
• True
• False

1 points

QUESTION 14

• Corey scoresX = 70 on his first exam, for which the entire class scored a mean of = 78 and standard deviation of = 6. The instructor wants to standardize the distribution of exam scores to have = 100 and = 15. What will Corey's grade on the exam be in the new distribution?

	a.	X =118
	b.	X = 80
	c.	X = 82
	d.	X = 120

1 points

QUESTION 15

• For a population of exam scores, a score ofX = 80 corresponds toz = -0.75 and a score ofX = 72 corresponds toz = -1.75. The population mean is = 85.
• True
• False

1 points

QUESTION 16

• A population of scores has = 44. In this population, a score ofX = 40 corresponds toz = -1.00. What is the population standard deviation?

	a.	6
	b.	4
	c.	8
	d.	2

1 points

QUESTION 17

• A Pearson correlation value (r) indicates the exact degree of accuracy in which a researcher can predict a participant's score on a second variable from their score on a first variable.
• True
• False

1 points

QUESTION 18

• A set ofX andY scores has a Pearson correlation ofr = 0.60. For these data, 60% of the variability inY scores can be predicted from the relationship of theY variable with theX variable.
• True
• False

1 points

QUESTION 19

• A negative correlation means that decreases in theX variable tend to be accompanied by decreases in theY variable.
• True
• False

1 points

QUESTION 20

• A researcher measures driving distance from college and weekly cost of gas for a group of commuting college students. Which kind of correlation is likely to be obtained for these two variables?

	a.	a positive correlation
	b.	a correlation near 1
	c.	a negative correlation
	d.	a correlation near 0

1 points

QUESTION 21

• A population ofN = 10 scores has = 21 and = 3. What is the population variance?

	a.	100
	b.	9
	c.	7
	d.	2

1 points

QUESTION 22

• Az-score ofz = -1.00 always indicates that a score is located exactly 1 standard deviation below the mean in a distribution.
• True
• False

1 points

QUESTION 23

• In a population with a mean of = 30 and a standard deviation of = 5, a score ofX = 18 would be an extreme value, far out in the tail of the distribution.
• True
• False

1 points

QUESTION 24

• For the following scores, which action will increase the range? Scores: 2, 6, 11, 15

	a.	subtract 3 points from the scoreX = 15
	b.	subtract 4 points from the scoreX = 11
	c.	subtract 3 points from the scoreX = 6
	d.	subtract 1 point from the scoreX = 2

1 points

QUESTION 25

• If a person scoresX = 80 on an exam withm = 75, they scored worse relative to others in the class if = 8 than if = 4.
• True
• False