Chapter 6

Question 1

The purpose of descriptive research

Answer 1

To help us describe the charcteristics of a sample pop being examamined

Question 2

Survey research

Answer 2

One that utilizes observational techniques to collect data

Question 3

Cross-sectional survey design

Answer 3

-uses a single group of participants and surveys that single group once

Question 4

Sucessive independent samples survey design

Answer 4

2 or more samples of respondents answer the same question at differnt points in time. (1 group answers the question, later on another group answers the same question)

Question 5

Logitudinal or panel design

Answer 5

Tests the same set of participants at multiple time points

Question 6

Demographic research

Answer 6

Describing patterns of basic life events and experiences and has a purpose of decribing changes in society

Question 7

Statistical notation

Answer 7

-used ro reprent data and helps scientists understand across a wide range of areas

Question 8

Frequency distributions

Answer 8

Summarize raw data by showing the number of scores that fall into each of several broad catagories

Question 9

Simple frequency distribution

Answer 9

The number of participants who obtained each score

Question 10

Grouped frequency distrubutions

Answer 10

Taking info from simple freq and placing them into groups or intervals

Question 11

Relative frequency

Answer 11

what poportion of my total does an interval represent

Question 12

2 ways to display frequency distribution

Answer 12

1. Freq histrogram

2. Freq polygons

Question 13

3 measures of central tendency

Answer 13

1. Mean
2. Median
3. Mode

Question 14

Confidence interval (error bars)

Answer 14

The confidence in the value of the mean.

Question 15

3 Measures of variability

Answer 15

1. Range
2. Variance
3. Standard Deviation

Question 16

Variance

Answer 16

Rhe amount of variability we have in our data

Question 17

Standar deviation

Answer 17

Squareroot of variance

Question 18

% between -1 and 1 SD of mean

Answer 18

68%

Question 19

% between -2 and 2 SD of mean

Answer 19

95%

Question 20

% between -3 and 3 SD of mean

Answer 20

99%

Question 21

On a normal curve ______ are the same value

Answer 21

Mean, median, mode

Question 22

Z score

Answer 22

How far away a person is from the mean(# of SDs)

Question 23

Positively skewed

Answer 23

Mean is pulled artivficially higher and the hump is closer to the y axis. Tail points in positive direction of x axis

Question 24

Negatively skewed

Answer 24

Mean is pulled artificially lower and the hump is farther away form the y axis. Tail points in negative direction of x axis

Question 25

3 Measures of variability

Answer 25

1. range
2. variance
3. Standard deviation