Econ 5

Fall26 UCSB

population

(N) complete set of all items of interest

sample

(n) observed subset of a population

Sample is related to

Statistic (Specific char. of sample)

Simple random sample

chosen strictly by chance. every member equally likely to be chosen

Systematic Sampling

Formula for selecting sample. J=N/n. select # from 1 to j. then use that # to start with and count every jth item

j equals

population divided by sample

Sampling error

Information is available on only a subset of all the population members.

Parameter is related to

population (specific char. of pop)

Nonsampling error

error unconnected with the kind of sampling procedure used.

examples of nonsampling errors

population sampled is not the relevant one
survey subjects may give dishonest answers
may be no response to survey questions

What are the two types of statistics

descriptive and inferential

descriptive statistics

graphing and numerical procedures to summarize and process data (describe data)

Inferential statistics

using data to make predictions, forecasts, and estimates to assist decision making. (inferences)

Categorical data

a def