Frequency and probability distributions, types of studies

Question 1

What is frequency?

Answer 1

The number of observations with a particular measurement

Question 2

What is a frequency distribution?

Answer 2

A distribution of how often each variable occurs in a sample

Question 3

Can we actually construct a frequency distribution?

Answer 3

Yes. It’s based on observations

Question 4

What is a probability distribution?

Answer 4

The distribution of a variable in the whole population

Question 5

Can we actually construct a probability distribution?

Answer 5

They’re just theoretical, probable. Several types to choose from

Question 6

What’s the relation between frequency and probability distribtions?

Answer 6

We compare frequency dists to prob dists to derive P-values

Question 7

What are two types of studies?

Answer 7

Experimental and observational

Question 8

What is an experimental study? What types of inferences can you draw from them?

Answer 8

Study where the researcher randomly assigns treatments to groups. Can draw cause and effect

Question 9

What is an observational study? What types of inferences can you draw from them?

Answer 9

Study where there’s no assignment of treatments made by the researcher. Can only look for associations but not causation

Question 10

What is relative frequency? How do you calculate it?

Answer 10

The proportion of observations with a given measurement. Calculated by dividing the frequency by the total number of observations

Question 11

What is a relative frequency distribution?

Answer 11

The proportion of how often a value occurs in a data set