Descriptive Statistics

Question 1

Used for those surveys where the numbers are compared and commented on.

Answer 1

Textual Presentation

Question 2

The lowest observed value in the data set.

Answer 2

Lower Limit

Question 3

Obtained by subtracting one unit of measure from the lower limit of the class interval.

Answer 3

Upper Limit

Question 4

Numbers that are halfway between the upper limit of a class and the lower limit of the next class.

Answer 4

Class Boundaries

Question 5

The average of the lower and upper limits of a given class interval.

Answer 5

Class Mark or Class Midpoint (CM)

Question 6

Obtained by dividing the frequency of a given class interval by the total number of observations.

Answer 6

Relative Frequency (RF)

Question 7

Obtained by multiplying the relative frequency by 100%.

Answer 7

Relative Percentage

Question 8

The accumulated frequency of a class.

Answer 8

Cumulative Frequency (CF)

Question 9

Used for depicting qualitative data that have been summarized in a frequency distribution.

Answer 9

Bar Graph

Question 10

Best used when the data set shows numbers that are independent of each other.

Answer 10

Bar Graph

Question 11

Uses the relative frequencies to subdivide the circle into sectors or slices that correspond to the relative frequency or relative percentage of each distinct groupings.

Answer 11

Pie Graph

Question 12

Used to show how a whole is divided into parts.

Answer 12

Pie Graph

Question 13

Uses line segments to connect the data points.

Answer 13

Line Graph

Question 14

A common graphical representation of quantitative data

Answer 14

Histogram

Question 15

Used when the categories are ranges of numbers

Answer 15

Histogram

Question 16

Provide information about a representation value of the data set.

Answer 16

Measures of Central Tendency

Question 17

Most common measures of Central Tendency

Answer 17

Mean
Median
Mode

Question 18

Sum of all observation divided by the total number of observations

Answer 18

Mean

Question 19

A point in the data set above and below which half of the cases fall.

Answer 19

Median

Question 20

The most frequently occurring value in the data set.

Answer 20

Mode

Question 21

Simplest measure of variability.

Answer 21

Range

Question 22

Measures the distance between the highest and lowest values in a set of data.

Answer 22

Range

Question 23

Measures the mean amount by which the values in a population, or sample, vary from their mean.

Answer 23

Mean Deviation

Question 24

Average squared difference of the values from the mean.

Answer 24

Variance

Question 25

It refers to the distortion or asymmetric in a symmetrical bell curve or normal distribution in a set of data.

Answer 25

Skewness

Question 26

Used to describe the degree of skewness of a distribution.

Answer 26

Pearson's first and second coefficients of skewness

Question 27

If the skewness is between -0.5 and 0.5

Answer 27

Fairly symmetrical

Question 28

If the skewness is between -1 and -0.5 (negatively skewed) or between 0.5 and 1 (positively skewed)

Answer 28

Moderately Skewed

Question 29

If the skewness is less than -1 (negatively skewed) or greater than 1 (positively skewed)

Answer 29

Highly Skewed

Question 30

Useful if the data exhibit a strong mode.

Answer 30

Pearson's first coefficients of skewness Pearson's mode skewness

Question 31

Useful if the data have a weak mode or multiple modes.

Answer 31

Pearson's second coefficients of skewness Pearson's median skewness

Question 32

It is more peaked than the normal distribution.

Answer 32

Leptokurtic Distribution

Question 33

The coefficient of kurtosis is usually found to be more than 3.

Answer 33

Leptokurtic Distribution

Question 34

Has extremely dispersed points along the X-axis, resulting in a lower peak when compared to the normal distribution.

Answer 34

Platykurtic Distribution

Question 35

What does "platy" mean?

Answer 35

Broad

Question 36

The coefficient of kurtosis is usually found to be less than 3.

Answer 36

Platykurtic Distribution

Question 37

It has a curve that's similar to that of the normal distribution.

Answer 37

Mesokurtic Distribution

Question 38

Distribution is largely normal.

Answer 38

Mesokurtic Distribution