Statistics 1

Qualitative: Words.

Quantitative: Numerical- Discrete-( able to count),

continuous-(equipment needed).

Bivariate- discrete and continuous.

Convenient Sampling- Anyone. Easy. Biased.

Quota Sampling- People have to be a certain type. Easy. Biased.

Cluster Sampling- Split into clusters then chosen at random. Easy. Biased.

Systematic Sampling- Picking a random number. To pick 10 out of 30 we chose every 3rd number. Easy. Biased- Order Of List.

GENERATING RANDOM NUMBERS:

POPULATION 100-

Shift Ran# (100)_Produces a random number.

Random Sample- every member has an equal chance at getting chosen.

Stratefied smapling- two way table.

Strata size x Sample size                                                                                                     Population

Primary Data- Data collected by yourself. Relevent and accurate. Expensive and a long time.

Secondry- Not collected yourself. Quick and Cheap. Not always relevent or accurate.

Collect-Surveys: Questionaires.                                                                                                                        - Interviews.                                                                                                                            - Observations.

Questionaires- Designed to obtain data. Short, simple, closed questions.                                       -Response Boxes.                                                                                                                     - Must have a time scale and not include      or      or      or       .

Telephone- Expensive and a bad response.

Postal- Cheap but lacks replies.

Face to Face- Expensive in time and money.

Email- Cheap and lack of response.

Interviewer- Biased. 

Control Groups- Test the effect.

Data Logging- Recored electronically.

Capture and Recapture-20 birds captured and tagged, recapture 100 birds 10 of them tagged.

10/100=20/n n- unknown population.

0.1= 20/n x n = 200.