Populations and Samples
The math department wants to know whether high school students with high GPAs play more videos games than students with low GPAs. 200 students, 50 from each grade, are randomly chosen and sent an email survey to fill out regarding how many hours they have spent playing video games since the school year started and their GPA.
The Population of interest was _____
Who are high school students?
Every student in OHS has their name put in a hat. Three of the students names are drawn to win a new iPad. This is an example of _________ sampling.
What is simple random sampling?
You’re investigating whether the age a person is impacts how afraid of falling they are.
The explanatory and response variables are _______
Explanatory: How old a person is
Response: Whether or not they are afraid of falling
Studies have shown that a high amount of shark bites correlates to a high amount of ice cream sales. The confounding variable is: _________
What is the temperature outside?
While conducting a survey to discover favorite vehicle types; a student only asks members his friends, and family. What type of bias might be present in this data set?
What is Undercoverage Bias?
Zoo keepers want to try a new diet for their Bears to see if it will help them gain weight. Of the 10 bears at the zoo, they randomly assigned 5 of them to continue with the old diet and 5 of them to try the new diet for 14 days. On each of the 14 days, the bears will be weighed to track any growth.
The Population of interest was _____
What are bears at the zoo?
The students in 5th period statistics are line up in front of the room. The teacher picked a random starting point. Every 5th student was picked after that. This is an example of _________ sampling.
What is systematic sampling?
A team of researchers are conducting experiments to determine if a persons ability to play a musical instrument affects their ability to solve complicated mathematical problems.
Explanatory: Their ability to play an instrument
Response: Their ability to solve mathematical problems
Studies have shown that there in 2020 there was a higher rate of amazon shopping, correlated with a lower amount of gas purchased. The confounding variable was _________
What is the Pandemic?
Call-in radio shows that solicit audience participation in surveys on controversial topics (abortion, affirmative action, gun control, etc.) are examples of __________ bias.
What is voluntary response bias?
A study was done to determine if eating chocolate during pregnancy has an effect on the overall health of the mother after the baby was born. The study asked about 300 pregnant women to report their chocolate consumption (Never/Seldom, Weekly, and Daily). Six months after they had given birth, the researchers then took vital signs to track how healthy the mothers were.
The population of interest was?
Who are all pregnant women?
The employees of a company are split into two groups, men and woman. In each of the groups 100 individuals are chosen at random to ask about their recent raise. This is an example of _______ sampling.
What is stratified random sampling? Remember with cluster sampling you take all the members from the chosen groups. In a stratified sample you group then sample again in each group.
Does eating bacon lead to high cholesterol? A team of researchers from the university of MadeThisUp; is seeking to find the answer to this question, by having 50 young adult men eat only bacon for 30 days, while testing their cholesterol before and after.
Explanatory: How much bacon they eat
Response: a High cholesterol
There is a correlation showing that people with larger shoe sizes tend to be better at solving mathematic questions. The confounding variable is ___________
What is age?
When OHS emails all of the students a survey asking them to fill it out and submit it, the results will be subjected to ______ Bias
What is Non-Response Bias?
In the coke a cola factory; every 100th can of Dr. Pepper is inspected by quality control to ensure that they are producing the Dr. Pepper correctly.
The population of interest is: _____________
What are Dr. Pepper cans produced at that factory?
After a hurricane, a disaster area is divided into 200 equal grid spaces. Thirty of the spaces are selected, and every occupied household in the space is interviewed to help focus relief efforts on what residents require the most. This is an example of _________ sampling.
What is cluster sampling?
Mr. Moore is looking at his grades for trimester 3, and is comparing the grades that students have; with the amount of essential skills assignments that have been turned in. He is trying to figure out if students that have lower grades, are more likely to complete missing essential skills assignments preceding the end of the trimester.
Explanatory: Higher Grades
Response: Willingness to complete essential skills assignments
Studies have shown that the more television sets a country has, the higher that country's life expectancy for the average citizen. What is the confounding variable?
What is money?
Students were asked in a survey from teachers "how often do you cheat on tests"? This is an examples a Response Bias known as _________.
What is "untruthful answer"?
Whenever customers purchase an item in the local grocery store the receipt has a survey at the bottom advertising a chance to win money if the customer completes the survey.
The population of interest is _____
Who are the customers of the local grocery store?
A researcher wants to know how many women in a community use smartphones. He decides to go to a popular mall for middle-income mothers and record their responses to collect necessary data. He asks the first 50 women who walk by if they use smart phones.
What is Convenience Sampling?
Kendra wants to know if drinking caffeine will make a person run faster. So, she attends track practice every day for 2 weeks. The first week she had all of the track runners drink monster energy drinks before they ran, the second week she had them drink water.
Explanatory: Drinking caffeine
Response: Being a faster runner.
More people die in avalanches when sales of snow chains go up. The confounding variable is _____
What is the weather?
Students were asked in a survey the following question: "Your OHS nutrition team works hard to serve your food. How much do you enjoy the extremely delicious food provided in the OHS Cafeteria?" The submissions are subjected to a form of Response Bias known as ________
What is "Phrasing"?