Population or Sample
In statistics, what is a population?
The entire group of individuals we want information about
Identify the type of sampling used.
"To gather information about the validity of a new standardized test for tenth-grade students in a particular state, a random sample of 15 high schools was selected from the state. The new test was administered to every 10th-grade student in the selected high schools."
Simple Random Sample
What is the response variable?
The outcome of a study/experiment.
*DAILY DOUBLE*
What is the least used type of random sample?
Hint: Not Simple, Stratified or Cluster
Systemic Random Sample
What is the penalty for speaking during a lesson?
One warning and then a 0
In Statistics, what is a sample?
A subset of individuals in the population from which we actually collect data
*DAILY DOUBLE*
Identify the type of sampling used:
"How much sleep do high school students get on a typical school night? An interested student designed a survey to find out. To make data collection easier, the student surveyed the first 100 students to arrive at school on a particular morning. These students reported an average of 7.2 hours of sleep on the previous night. "
Convenience Sample
What are the four principles of experimental design?
Control, Replication, Random Assignment and Comparison.
*DAILY DOUBLE*
If I want to find out the average income in the U.S. and I randomly select 15 cities as my sample, what type of random sample have I collected?
Cluster Random Sample
Does Mr. Kalu allow notebooks to be used during tests/quizzes?
No
Identify the sample in the following scenario:
"A furniture maker buys hardwood in large batches. The supplier is supposed to dry the wood before shipping (wood that isn’t dry won’t hold its size and shape). The furniture maker chooses five pieces of wood from each batch and tests their moisture content. If any piece exceeds 12% moisture content, the entire batch is sent back."
The 5 pieces of wood that are selected from that batch and tested
Which sampling method requires that groups be created based on similarity between the individuals?
Stratified Random Sample
Does reducing screen brightness increase battery life in laptop computers? To find out, researchers obtained 30 new laptops of the same brand. They chose 15 of the computers at random and adjusted their screens to the brightest setting. The other 15 laptop screens were left at the default setting—moderate brightness. Researchers then measured how long each machine’s battery lasted. Was this an observational study or an experiment?
Experiment
What kind of sampling method uses this sentence structure?
"I will assign each _______ with a numerical label of the __________ digits starting from the _______ to the _________ . I will read digits from line (________) in groups of ( ________ ). I will ignore any repeated digits and any digits that are not in my label. I will stop when I have selected ( __________ )."
Simple Random Sample
What is the consequence for switching seats without permission?
A warning is given once and then a 0 for every future offence
*DAILY DOUBLE*
What function does a census serve?
It collects data from every individual in the population.
What sampling method is used:
"In June 2008, Parade magazine posed the following question: “Should drivers be banned from using all cell phones?” Readers were encouraged to vote online at parade.com. The July 13, 2008, issue of Parade reported the results: 2407 (85%) said “Yes” and 410 (15%) said “No.”
Voluntary Response Sample
What is a confounding variable?
A variable other than the explanatory variable that could help explain or predict changes in a response variable.
When do we use this sentence structure?
"I will create strata based on _________: (List strata names). I will assign each _______ with a numerical label of the __________ digits starting from the _______ to the _________: (Include breakdown of labels for each strata). I will read digits from line (________) in groups of ( ________ ). I will ignore any repeated digits and any digits that are not in my label. I will stop when I have selected ( __________ ): (State amount taken from each strata)."
When taking a stratified random sample
Will tests/quizzes be curved in Q2?
Mostly no
Identify the population in this scenario:
"A large retailer prepares its customers’ monthly credit card bills using an automatic machine that folds the bills, stuffs them into envelopes, and seals the envelopes for mailing. Are the envelopes completely sealed? Inspectors choose 40 envelopes at random from the 1000 stuffed each hour for visual inspection. Identify the population and the sample."
The 1000 envelopes stuffed each hour
Which sampling method is based on proximity?
Cluster Random Sample
*DAILY DOUBLE*
What is the difference between an experiment and an observational study?
An observational study observes individuals and measures variables of interest but does not attempt to influence the responses.
An experiment deliberately imposes some treatment on individuals to measure their responses.
When do we use this sentence structure:
"I will assign ____________ a numerical label of ________ digits starting from ___ to ___. I will read digits from line (________) in groups of ( ________ ). I will assign the first _______ that I select to ________. I will assign the Second…, Third…, etc. ________ that I select to _______. I will compare ______ between the ______ groups."
When designing a completely randomized experiment
What is the most essential material for class and what is the consequence for not having it?
Notebook.
Consequence: 0