chapter 14 Graphic and Descriptive Techniques

Question 1

Mode

Answer 1

Most common score

Question 2

Median

Answer 2

Middlemost score

number of scores +1 / 2

Question 3

mean

Answer 3

Sum of all the scores divided by the number of scores.

Question 4

Range

Answer 4

Highest score – Lowest score

Question 5

Percentile

Answer 5

Score below which a certain number of cases in a distribution fall

Question 6

interquartile

Answer 6

75th percentile – 25th percentile

Q3 – Q1

Question 7

Semi-interquartile range

Answer 7

(Q3 – Q1)/2

Question 8

variance

Answer 8

Average of the squared deviations from the mean.

Question 9

standard deviation

Answer 9

Square root of the variance

Question 10

scattergram

Answer 10

Often used with correlation coefficient
A correlation is a statistic indicating the strength of the relationship between two variables
Prediction of one of the variables can be achieved with regression

Question 11

Correlation Coefficient

Answer 11

Measures strength of association between variables.
Does NOT indicate causation
Most commonly used is Pearson’s r
Value is between – 1.0 and +1.0

Question 12

Regression

Answer 12

Predicting the value of one variable from another from the equation for a line
y= mx+b

Question 13

line graph

Answer 13

Y-axis is the dependent variable

X-axis is the independent variable

Question 14

bar graph

Answer 14

Used to represent categorical data

Question 15

time-series graph

Answer 15

X-axis represents the passage of time

Question 16

sum of squares

Answer 16

the sum of the squared deviations from the mean

Question 17

correlation

Answer 17

the strength of the relationship between two variables

Question 18

regression

Answer 18

predicting the value of one variable from another based on their correlation

Question 19

cohens d