Biostats mod 3

Question 1

6 important questions to ask in research design

Answer 1

1. what is research question
2. what design is being used
3. what kind of data to collect
4. how do these data address the research question
5. what is the measurement scale
6. what errors and bias are likely

Question 2

3 keys in most research project

Answer 2

1. clearly define concepts
2. operationally define in feasable fashion
3. carry out study as planned

Question 3

def. discrete scales

Answer 3

used to encode categorical variables or fixed number of values

Question 4

2 types of discrete scales

Answer 4

1. nominal - code when there is no order (labels) - language

2. ordinal - when there is an order, but distance between intervals may be variable

Question 5

def. continuous scales

Answer 5

used for data without a fixed number of possible values - temmperature

Question 6

2 types of cont. scales and diference

Answer 6

ratio - has true zero - Kelvin

interval - relative zero - celcius

Question 7

what is rule of thirds

Answer 7

stats takes time
1/3 - cleaning data
1/3 - main analyses planned
1/3 - go back and challenge data

Question 8

use of histograms

Answer 8

gives general visual info about behavior and traits in study

Question 9

what does boxplot show

Answer 9

mean of indivs. of certain groups and upper and lower limits of the values