Deck 3: Descriptive Statistics

Question 1

When students enroll in school and are provided with an identification number-a combination of letters and numbers-this number is on the ___ scale.

A) ratio
B) interval
C) ordinal
D) nominal

Answer 1

D

Question 2

In order for a score to be considered significant it must be at least two standard deviations from the mean.

Answer 2

False

Question 3

Derived scores allow professionals to compare how a student performed on a task in comparison with a larger group.

Answer 3

True

Question 4

The number of times a score occurs in a distribution can be determined by completing a frequency count.

Question 5

This term is used when a national sample of students of the same age/grade take the same assessment and establish a mean and standard deviation.

A) Norm-referenced
B) Standardized
C) Derived scores
D) Measures of central tendency

Question 6

Using the information below, answer the questions that follow.
Miss Bridget teaches in a small learning support class. The follow are the data from a recent math assessment from three of her students:
What is the variance?

A) 4.11
B) 10
C) 79.33
D) 16.8889

Question 7

Median is another name for simple average.

Question 8

Organizing data to see how the data spread away from the mean is called

A) Measures of Dispersion
B) Measures of Central Tendency
C) Frequency
D) Normal Distribution

Question 9

Large sets of data are organized and understood through methods known as Measures of Central Tendency.

Question 10

A multimodal distribution means that there are three or more modes.

Question 11

Which number is representative of a raw score?

A) Total test items = 25
B) Correct answers = 20
C) Incorrect answers = 5
D) Ratio = 20/25

Question 12

Variance is described as the degree or amount of dispersion in a data set.

Question 13

This scale's numbers are used for identification that ranks greater or lesser quality or amount. The numbers are equidistant on the scale.

A) ratio
B) interval
C) ordinal
D) nominal

Question 14

This scale is used for direct comparisons and mathematical manipulations. The numbers on the scale are equidistant from each other and have a true meaning of absolute zero.

A) ratio
B) interval
C) ordinal
D) nominal

Question 15

Students who participated in the science fair were ranked by category and received first-, second-, and third-place ribbons. This is an example of what type of scale?

A) ratio
B) interval
C) ordinal
D) nominal

Question 16

It is possible for the mean score to become influenced by an extreme score in the data set.

Question 17

What does the vertical line in the normal distribution represent?

A) Median
B) Mode
C) Mean
D) Central tendency

Question 18

Organizing data to see how the data cluster is called

A) Measures of Dispersion
B) Measures of Central Tendency
C) Frequency
D) Normal Distribution

Question 19

In a normal distribution, most students' scores fall at the edges of the bell curve.

Question 20

The square root of the variance is the sum of squares.

Question 21

What type of distribution is depicted below?

A) Positive skew-Large number of scores occur below the mean.
B) Positive skew-Large number of scores occur above the mean.
C) Negative skew-Large number of scores occur below the mean.
D) Negative skew-Large number of scores occur above the mean.

Question 22

Using the bell curve below, answer the questions that follow.

Point b on the normal distribution represents the IQ cut-off score for which disability category?

A) Learning disability
B) Gifted
C) Mental retardation
D) Autism

Question 23

How are the measures of central tendency different than the measures of dispersion?

Question 24

A graph of class data is below. What is this type of graph called?

A) Frequency distribution
B) Normal distribution
C) Bell curve
D) Frequency polygon

Question 25

A person who scores at the 85%tile scored as well or better than ___.

A) 14% of the students in that age/grade.
B) 84% of the students in that age/grade.
C) 85% of the students in that age/grade.
D) 15% of the students in that age/grade.

Question 26

Using the information below, answer the questions that follow.
Miss Bridget teaches in a small learning support class. The follow are the data from a recent math assessment from three of her students:
What is the standard deviation?

A) 4.11
B) 10
C) 79.33
D) 16.8889

Question 27

What is the percentile rank that is equivalent to the mean?

A) 20
B) 50
C) 80
D) 90

Question 28

When the mean score is represented as ± 2, what type of score is this?

A) Decile
B) T-score
C) Stanine
D) Z-score

Question 29

Using the data set below, answer the questions that follow.

What is the range?

A) 50
B) 76
C) 29
D) 63

Question 30

What type of distribution is depicted below?

A) Positive skew-Large number of scores occur below the mean.
B) Positive skew-Large number of scores occur above the mean.
C) Negative skew-Large number of scores occur below the mean.
D) Negative skew-Large number of scores occur above the mean.

Question 31

Why should care be taken when interpreting results whose distributions are positively or negatively skewed?

Question 32

A person with an obtained IQ score of 115 would have a z score of:

A) +1
B) +2
C) 0
D) -1

Question 33

Explain how a mean scores can be influenced by extreme scores in a data set.

Question 34

Using the data set below, answer the questions that follow.

What is the mode?

A) 26
B) 76
C) 68
D) 69

Question 35

What type of score is derived when scores are divided into 10 groups, and each group represents 10% of the obtained scores?

A) Decile
B) T-score
C) Stanine
D) Z-score

Question 36

Discuss at least five different mistakes made by professionals in the identification process.

Question 37

Using the bell curve below, answer the questions that follow.

Point a on the normal distribution represents the IQ cut-off score for which disability category?

A) Learning disability
B) Gifted
C) Mental retardation
D) Autism

Question 38

Using the data set below, answer the questions that follow.

What is the median?

A) 69
B) 76
C) 26
D) 67

Question 39

What is a normal distribution and why is it important in understanding student performance?

Question 40

Using the data set below, answer the questions that follow.

What is the mean?

A) 69
B) 63
C) 26
D) 67

Question 41

Define and provide an example of the four different numerical scales.

Question 42

What are the four steps required to calculating variance.

Question 43

Why is it necessary to understand the average performance of students in a particular grade or age level?

Question 44

Draw pictures of a negatively skewed distribution and a positively skewed distribution. Explain each.

Question 45

Explain why it is important to graph data.

Question 46

There is great debate in the field regarding the types of scores yielded from assessments. Which scores do you think will be most valuable to you? Why?

Question 47

What is a mean difference and why should members of the field be particularly interested in its effects.