Stats exam 1 Terms

Question 1

Data

Answer 1

Recorded observations

Question 2

Statistics

Answer 2

Organizes summaries data

Question 3

Quantitative data

Answer 3

Numbers

Question 4

Qualitative data/categorical data

Answer 4

Describes

Question 5

Variable

Answer 5

Can be measured

Ex. Anxiety rating, Love, hate, height, weight

Question 6

Independent variable

Answer 6

Variable researchers manipulate

Question 7

Dependent variable

Answer 7

Constant variable, just the measure

Question 8

Continuous variable

Answer 8

Could go on indefinitely (height, weight)

Question 9

Discrete variable

Answer 9

Either or nothing In between

Question 10

Random selection

Answer 10

Every person has an equal chance to be invited into the research study

Question 11

Random assignment

Answer 11

Already have sample, and from found a random way to assign

Question 12

True experiment

Answer 12

Have an IV, DV, Random selection, Random assignment

• cause can be determined

Question 13

Control group

Answer 13

Group that doesn’t receive treatment

Question 14

Experimental group

Answer 14

Receives treatment

Question 15

Placebo

Answer 15

Fake inert substance

Question 16

Quasi experiment

Answer 16

Has an IV, DV, Random selection but no Random assignment

Question 17

Positive Correlation

Answer 17

• variables are moving in the same direction

Question 18

Negative correlation

Answer 18

• variables go in opposite directions

Question 19

Confound variable

Answer 19

Anything that can mess up anything in your study

Question 20

Correlation

Answer 20

Can never infer cause

Question 21

Operational definition

Answer 21

Very precise definition and the variables definition involved

Question 22

Outlier

Answer 22

An extreme

Question 23

Nominal scale

Answer 23

• having to do with names
• used to keep info organized
• no math value

Question 24

Ordinal scale

Answer 24

• ranking scale
• not equal between values

Ex. Ugly scale
2. Laurie is more popular than Sarah

Question 25

Interval scale

Answer 25

• difference between values are mathematically equal

- has a fake zero (Arbitrary zero)

Question 26

Ratio scale

Answer 26

• has the features of an interval scale but has an absolute zero

Question 27

What are the measures of variability ?

Answer 27

1 Variance 
2 Standard deviation
3 Standard error 
4. Range 
5 Interquartile Range (IQR)
6 Semi-interquartile Range (SIQR)

Question 28

What are the measures of Central Tendency ?

Answer 28

1. Mean
2. Mode
3. Median (even and odd #)
4. Weighted mean
5. Mode

Question 29

What is the weakness of using the mean ?

Answer 29

The average can be tricked although there are extremes

Question 30

What are the three types of modes?

Answer 30

• Unimodal
• bimodal
• multimodal