Question 1

The range is

Accepted Answer

A)   the difference between the highest and lowest scores in a distribution.
B)   the most commonly used measure of variation.
C)   the average deviation of scores from the mean.
D)   the most frequently occurring score in a distribution of scores.E) A) and D)
F) A) and B)

Question 2

The difference between the highest and lowest scores in a distribution is the

Accepted Answer

A)   mean.
B)   range.
C)   median.
D)   standard deviation.E) All of the above
F) C) and D)

Question 3

The maximum height of a normal curve corresponds to the ________ of a normal distribution.

Accepted Answer

A)   range
B)   mean
C)   standard deviation
D)   statistical significanceE) C) and D)
F) None of the above

Question 4

A normal curve would be LEAST likely to characterize a large random sample of

Accepted Answer

A)   body weights.
B)   intelligence scores.
C)   family incomes.
D)   professional baseball batting averages.E) A) and B)
F) B) and D)

Question 5

A statistically significant difference between two sample groups is NOT likely to be

Accepted Answer

A)   a reflection of differences between the populations they represent.
B)   due to chance variation within and between the sample groups.
C)   observed more than 5 percent of the time the groups are compared.
D)   observed when the two groups are very large.E) B) and D)
F) B) and C)

Question 6

To understand the British newspaper headline "Income for 62% Is Below Average," a reader needs to appreciate the distinction between the ________ and the mean.

Accepted Answer

A)   range
B)   standard deviation
C)   mode
D)   medianE) A) and C)
F) B) and C)

Question 7

In a distribution of test scores,which measure of central tendency would likely be the most affected by a couple of extremely high scores?

Accepted Answer

A)   median
B)   mode
C)   standard deviation
D)   meanE) A) and B)
F) A) and C)

Question 8

The most frequently occurring score in a distribution of scores is the

Accepted Answer

A)   mode.
B)   median.
C)   standard deviation.
D)   mean.E) A) and B)
F) B) and C)

Question 9

The mode,median,and mean are measures of

Accepted Answer

A)   central tendency.
B)   variation.
C)   correlation.
D)   statistical significance.E) B) and C)
F) B) and D)

Question 10

In a group of five individuals,two report annual incomes of $10,000,and the other three report incomes of $14,000,$15,000,and $31,000,respectively.The mode of this group's distribution of annual incomes is

Accepted Answer

A)   $10,000.
B)   $15,000.
C)   $16,000.
D)   $31,000.E) A) and D)
F) C) and D)

Question 11

A random sample of females was observed to exhibit a lower average level of self-esteem than a random sample of males.To assess the likelihood that this observed difference reflects a real difference in the average self-esteem of the total population of males and females,you should

Accepted Answer

A)   construct a bar graph.
B)   calculate the correlation.
C)   plot the distribution of self-esteem levels among all males and females.
D)   conduct a test of statistical significance.E) None of the above
F) All of the above

Question 12

If a set of standardized test scores is normally distributed,having a mean of 50 and a standard deviation of 10,approximately 68 percent of the group members receive scores somewhere between

Accepted Answer

A)   50 and 60.
B)   45 and 55.
C)   40 and 60.
D)   35 and 65.E) C) and D)
F) None of the above

Question 13

For which of the following distributions of scores would the median most clearly be a more appropriate measure of central tendency than the mean?

Accepted Answer

A)   16,28,4,8,24
B)   9,6,9,12,9
C)   8,9,12,10,16
D)   6,18,4,5,2E) C) and D)
F) B) and D)

Question 14

Mrs.Smith is measuring the height of all the children in her class and notices that the scores form a symmetrical,bell-shaped distribution.This is also known as the

Accepted Answer

A)   central tendency.
B)   range.
C)   normal curve.
D)   standard deviation.E) A) and D)
F) A) and C)

Question 15

Random samples provide ________ estimates of population averages if the samples have small ________.

Accepted Answer

A)   good;means
B)   good;standard deviations
C)   poor;means
D)   poor;standard deviationsE) A) and B)
F) B) and C)

Question 16

A normal curve would approximate the distribution of

Accepted Answer

A)   males and females in the total American population.
B)   American children enrolled in each of the first through sixth grades.
C)   the physical heights of all American women.
D)   all of these data.E) C) and D)
F) A) and B)

Question 17

Faustin,a member of his school's golf team,has an opportunity to play against a nationally acclaimed professional golfer.How many holes of golf should Faustin choose to play with the professional in order to maximize his own slim chances of winning?

Accepted Answer

A)   9
B)   18
C)   27
D)   36E) A) and B)
F) A) and C)

Question 18

Approximately what percentage of the cases represented by the normal curve fall between -1 and +1 standard deviations from the mean?

Accepted Answer

A)   16
B)   34
C)   68
D)   95E) All of the above
F) B) and C)

Question 19

If IQ scores are normally distributed,having a mean of 100 and a standard deviation of 15,approximately what percentage of people have IQ scores somewhere between 70 and 130?

Accepted Answer

A)   34
B)   50
C)   68
D)   95E) All of the above
F) A) and B)

Question 20

Five students received the following test scores: 7,11,5,6,and 11.Calculate the mode,median,mean,and range of this distribution of scores.Which measure of central tendency would change the most if an additional test score of 2 was included in the distribution?

Accepted Answer

The answer of Five students received the following test scores:...

Exam 3: Research Strategies: How Psychologists Ask and Answer Questions

If a set of standardized test scores is normally distributed,having a mean of 50 and a standard deviation of 10,approximately 68 percent of the group members receive scores somewhere between

Correct AnswerverifiedShow Answer

For which of the following distributions of scores would the median most clearly be a more appropriate measure of central tendency than the mean?

Correct AnswerverifiedShow Answer

Mrs.Smith is measuring the height of all the children in her class and notices that the scores form a symmetrical,bell-shaped distribution.This is also known as the

Correct AnswerverifiedShow Answer

Faustin,a member of his school's golf team,has an opportunity to play against a nationally acclaimed professional golfer.How many holes of golf should Faustin choose to play with the professional in order to maximize his own slim chances of winning?

Correct AnswerverifiedShow Answer

To understand the British newspaper headline "Income for 62% Is Below Average," a reader needs to appreciate the distinction between the ________ and the mean.

Correct AnswerverifiedShow Answer

A normal curve would be LEAST likely to characterize a large random sample of

Correct AnswerverifiedShow Answer

A random sample of females was observed to exhibit a lower average level of self-esteem than a random sample of males.To assess the likelihood that this observed difference reflects a real difference in the average self-esteem of the total population of males and females,you should

Correct AnswerverifiedShow Answer

The mode,median,and mean are measures of

Correct AnswerverifiedShow Answer

If IQ scores are normally distributed,having a mean of 100 and a standard deviation of 15,approximately what percentage of people have IQ scores somewhere between 70 and 130?

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The maximum height of a normal curve corresponds to the ________ of a normal distribution.

Correct AnswerverifiedShow Answer

A statistically significant difference between two sample groups is NOT likely to be

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The most frequently occurring score in a distribution of scores is the

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In a group of five individuals,two report annual incomes of $10,000,and the other three report incomes of $14,000,$15,000,and $31,000,respectively.The mode of this group's distribution of annual incomes is

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A normal curve would approximate the distribution of

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Random samples provide ________ estimates of population averages if the samples have small ________.

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The difference between the highest and lowest scores in a distribution is the

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The range is

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Approximately what percentage of the cases represented by the normal curve fall between -1 and +1 standard deviations from the mean?

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Five students received the following test scores: 7,11,5,6,and 11.Calculate the mode,median,mean,and range of this distribution of scores.Which measure of central tendency would change the most if an additional test score of 2 was included in the distribution?

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In a distribution of test scores,which measure of central tendency would likely be the most affected by a couple of extremely high scores?

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Random samples provide estimates of population averages if the samples have small .

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