1.4-1.6 Statistics and samples

Question 1

frequency

Answer 1

number of obseravtions having a particular value of the measurement

Question 2

frequency distribution

Answer 2

shows how often each value of the variable occurs in the sample

Question 3

probability distribution

Answer 3

distribution of a variable in the whole population

Question 4

normal distribution

Answer 4

familiar ‘bell curve’; most important probability distribution in all of statistics

Question 5

experimental study

Answer 5

the researcher assigns treatments randomly to individuals

Question 6

observational study

Answer 6

assignment of treatments is not made by the researcher

Question 7

can determine cause-and-effect relationships between variables

Answer 7

experimental studies

Question 8

can only point to associations

Answer 8

observational studies