Week 13

Question 1

What is base N

Answer 1

The total number of cases in a distribution

Question 2

What is bimodal distribution

Answer 2

A distribution that has two nonadjacent categories with about the same number of cases, and these categories have more cases than any other categories

Question 3

What is chi square

Answer 3

An inferential statistic used to test hypotheses about relationships between two or more variables in a cross tabulation

Question 4

What is correlation coefficient (r)

Answer 4

A summary statistic that varies from 0-1 or -1 with 0 indicting the absence of a linear relationship between two quantitative variables and 1 or -1 indicating that the relationship is completely described by the line representing the regression of the dependent variable on the independent variable

Question 5

What is cross tabulation.

Answer 5

A bivariate (two-variable) distribution showing the distribution of one variable for each category of another variable

Question 6

What are descriptive statistics

Answer 6

Statistics used to describe the distribution of and relationship among variable

Question 7

What is elaboration analysis

Answer 7

The process of introducing a third variable into an analysis in order to better understand - to elaborate - the bivariate (two-variable) relationship under consideration; additional control variable also can be introduced

Question 8

What are frequency distributions

Answer 8

Numerical display showing the number of cases, and usually the percentage of cases (the relative frequencies) corresponding the each value or group of values of a variable

Question 9

What is gamma

Answer 9

A measure of association sometimes used in cross-tabular analyses

Question 10

What is grouped frequency distribution

Answer 10

A frequency distribution in which the data are organised into categories, either because there are more values than can be easily displayed or because the distribution of the variable will be clearer or more meaningful

Question 11

What is histogram

Answer 11

A graphic for quantities variables in which the variables distribution is displayed with adjacent bars

Question 12

What is interquartile range

Answer 12

The range in a distribution between the end of the first quartile and the beginning of the third quartile

Question 13

What is marginal distributions

Answer 13

The summary distributions in the margins of a cross tabulation that correspond to the frequency distribution of the row variable and of the column variable

Question 14

What is mean

Answer 14

The arithmetic or weighted, average, computed by adding up the value of all the cases and dividing by the total number of cases

Question 15

What is measure of association

Answer 15

A type of descriptive statistics that summarise the strength of an association

Question 16

What is median

Answer 16

The position average or the point that divides a distribution in half

Question 17

What is mode

Answer 17

The most frequent value in a distribution also termed the probability average

Question 18

What is monotonic relationship

Answer 18

A pattern of association in which the value of cases on one variable increases or decreases fairly regularly across the categories of another variable

Question 19

What is negatively skewed

Answer 19

A distribution in which cases cluster to the right side and the left tail of the distribution is longer than the right

Question 20

What is positively skewed

Answer 20

Describes a distribution in which the cases cluster to the left and the right tail of the distribution is longer than the left

Question 21

What are quartiles

Answer 21

The points in a distribution corresponding to the first 25% of the cases, the first 50% of the cases and the top 25% of the causes

Question 22

What is regression analysis

Answer 22

A statistical technique for characterising the pattern of s relationship between two quantitative variables in terms of a linear equation and for summarising the strength of this relationship

Question 23

What is skewness

Answer 23

A feature of a variables distribution, referring to the extent to which cases are clustered more at one or the other end of the distribution rather than around the middle

Question 24

What is standard deviation.

Answer 24

The square root of the average squared deviation to each case from the mean

Question 25

What are subtables

Answer 25

Tables describing the relationship between two variable within the discrete categories of one or more other control variables

Question 26

What is unimodal distribution

Answer 26

A distribution of a variable in which there is only one value that is more frequent