Ch. 1-4 test

Question 1

Methods of organizing, summarizing, and presenting data in an informative way.

Answer 1

Descriptive Statistics

Question 2

Methods used to estimate a property of a population on the basis of a sample

Answer 2

Inferential Statistics

Question 3

The entire set of individuals or objects of interest or the measurements obtained from all individuals or objects of interest

Answer 3

Population

Question 4

A portion, or part of the population

Answer 4

Sample

Question 5

What’s the difference between quantitative and qualitative

Answer 5

Qualitative is non-numeric and Quantitative is numeric

Question 6

Variables that can only assume certain values and there are gaps between the values

Answer 6

Discrete variables

Question 7

Variables that can assume any value within a specific range.

Answer 7

Continuous variables

Question 8

Describe ordinal measurements

Answer 8

Ranked based on defined attribute or qualitative variable

Question 9

Describe nominal measurements

Answer 9

Can only be classified and counted. Examples are labels or names

Question 10

Describe interval measurements

Answer 10

The interval between values has to have meaning such as a known scale. Has no defined 0

Question 11

Describe ratio measurements

Answer 11

Based on a scale of known measurements and has a meaningful zero

Question 12

A grouping of qualitative data into mutually exclusive and collectively exhaustive classes showing number of observations in each class

Answer 12

Frequency table

Question 13

A graph that shows qualitative classes on the horizontal axis and the class frequency on the vertical axis

Answer 13

Bar chart

Question 14

A chart that shows the proportion or percentage that each class represents of the total number of frequencies

Answer 14

Pie Chart

Question 15

A grouping of quantitative data into mutually exclusive and collectively exhaustive classes showing the number of observations in each class

Answer 15

Frequency distribution

Question 16

Using a percentage to describe frequency distribution

Answer 16

Relative Frequency distribution

Question 17

A graph in which the classes are marked on the horizontal axis and the class frequencies on the vertical axis. Like a bar chart, but bars or adjacent with no space.

Answer 17

Histogram

Question 18

Shows the shape of a distribution and is similar to a histogram. uses a line to connect segments mid points

Answer 18

Frequency Polygon

Answer 19

Cumulative Frequency Distribution

Answer 20

Arithmetic mean

Question 21

The midpoint of the values after they have been ordered from the minimum to the maximum values

Answer 21

median

Question 22

Class of distribution with the highest frequency

Answer 22

mode

Question 23

A convenient way to compute the arithmetic mean when there are several observations of the same value

Answer 23

Weighted mean

Question 24

Used to find percentage change over time.

Answer 24

Geometric mean

Question 25

Dispersion the measures The maximum - the minimum value

Answer 25

Range

Question 26

The arithmetic mean of the square deviations form the mean

Answer 26

Variance

Question 27

The square root of the variance

Answer 27

Standard Deviation

Question 28

For any set of observations, the proportion of the values that lie within k standard deviations of the mean is at least 1-1/ksquared

Answer 28

Chebyshev's theorem

Question 29

States that for a bell shaped frequency distribution, 68% of the observations will lie within plus or minus 1 SD, 95% within 2, and 99.7 within 3.

Answer 29

Empirical rule

Question 30

Summarizes the distribution of one variable by stacking dots at points on a number line that shows the values of the variable.

Answer 30

Dot plot

Question 31

Values of an ordered data set that divide the data into four intervals

Answer 31

Quartiles

Question 32

Values of an ordered data set that divide the data into 10 equal parts

Answer 32

Deciles

Question 33

Values of an ordered data set that divide the data into 100 intervals

Answer 33

Percentiles

Question 34

A graphic display that shows the general shape of a variables distribution based on 5 descriptive statistics, minimum, maximum, 1st & 3rd quartiles, and median.

Answer 34

Box Plot

Question 35

graphical technique used to show the relationship between two variables measured with interval or ratios scales

Answer 35

Scatter Diagram

Question 36

A table used to classify sample observations according to two identifiable characteristics

Answer 36

Contingency table