📚

All Subjects

 > 

📊 

AP Stats

 > 

🔎

Unit 3

3.2 Introduction to Planning a Study

2 min readjune 8, 2020

Kanya Shah


Planning A Study

✏️Planning a study involves identifying what type of sampling method you’d like to use, who/what your population is, and ruling out steps that would result in false results. 
Population: it is the entire group of individuals we’d like to gain information about within a statistical study.
Census: collects data from every individual in a population. This is extremely time consuming and expensive. 
Sample: a small portion of the population from which we collect data. 
*an individual can be an object, company, etc. Not limited to organisms.
To make a conclusion about a certain population, begin by planning out a sample survey by identifying the population. A sample survey is a study that collects data from a sample that is chosen to represent a specific population. Determine what you’d like to measure from the population you’ll be choosing a sample from. 
🔭Observational Studies observe individuals and measure variables of interest but don’t attempt to influence the responses. In other words, these studies look for association between variables not causation because in a study, no treatment is imposed so you cannot assume that one variable caused a certain outcome. You can establish a plausible relationship or association between two variables depending on whether the data is valid. The data you collect can only be applied to the population of generalization or the population that your sample researched. Observational studies associations often fail because of confounding between the explanatory and response variables. 
👀Confounding occurs when two variables are associated in a way that their effects on the response variable cannot be deciphered from each other individually. 
*In an experiment, treatments are imposed but in studies, you gather data to examine possible relations between variables.
https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2Ftumblr_opt4u0wAib1t4ntovo1_400.jpg?alt=media&token=d588a286-6230-4cee-aba0-230ccf511b2b
Courtesy of Tumblr

Resources:

Was this guide helpful?

🔍 Are you ready for college apps?
Take this quiz and find out!
Start Quiz
FREE AP stats Survival Pack + Cram Chart PDF
Sign up now for instant access to 2 amazing downloads to help you get a 5
Browse Study Guides By Unit
📆
Big Reviews: Finals & Exam Prep
✏️
Blogs
✍️
Free Response Questions (FRQs)
👆
Unit 1: Exploring One-Variable Data
✌️
Unit 2: Exploring Two-Variable Data
🎲
Unit 4: Probability, Random Variables, and Probability Distributions
📊
Unit 5: Sampling Distributions
⚖️
Unit 6: Inference for Categorical Data: Proportions
😼
Unit 7: Inference for Qualitative Data: Means
✳️
Unit 8: Inference for Categorical Data: Chi-Square
📈
Unit 9: Inference for Quantitative Data: Slopes
Join us on Discord
Thousands of students are studying with us for the AP Statistics exam.
join now
Play this on HyperTyper
Practice your typing skills while reading Introduction to Planning a Study
Start Game
💪🏽 Are you ready for the Stats exam?
Take this quiz for a progress check on what you’ve learned this year and get a personalized study plan to grab that 5!
START QUIZ
Hours Logo
Studying with Hours = the ultimate focus mode
Start a free study session
📱 Stressed or struggling and need to talk to someone?
Talk to a trained counselor for free. It's 100% anonymous.
Text FIVEABLE to 741741 to get started.
© 2021 Fiveable, Inc.