Bias
Sampling Methods
Definitions
Random Math
Random Random
100
True or False:
Biased samples are ok as long as the sample size is large enough.
False, biased samples are trash
100
True or False:
The best way to make sure your sample is unbiased is to think carefully about the people you want to include in your sample and then include them in the sample.
False
100
True or False:
In order to use sample statistics they must be identical to the population parameter values they represent.
False (sampling variability)
100
True or False:
If I sample 10 students in a class of 30 and the average height of those students is 66 inches that means the average height of the entire class of 30 is 66 inches.
False
100
True or False:
CNHS will be undergoing a school review next Monday through Wednesday.
True
200
In order to prevent bias in our samples we want to make sure our samples are__________________.
Random
200
A process that is unpredictable, where each element has an equal opportunity to be selected is __________.
Random
200
The entire group of individuals or items we want information about.
Population
200
I take my pulse every day for 5 days. It is 78, 84, 72, 91, and 75. What type of data is this?
Quantitative (Numerical)
200
This artist recently (2024) had a song hit No. 1 on Both the Hot 100 & Hot Country Songs Charts.
Beyonce
300
Baltimore city sent out a survey to a sample of residents asking what their greatest neighborhood needs are. The survey was sent to all of the apartments in the Inner Harbor area. What type of bias is this most likely to result in?
Undercoverage
300
Olivia and MaKenzie wanted to find out how many tater tots were included in each lunch on average. They chose a random student in line and counted their tater tots. They then did the same for every 6th student in line. This is an example of what type of random sampling?
Systematic random sampling
300
A subset of the entire group of individuals or items we want information about.
Sample
300
A student asked a random sample of 12th graders if they were athletic. The possible responses were no, a little, and yes. What type of data would this survey generate?
Categorical
300
In terms of population, how much larger is India than the United States?
about 4 times larger
400
Caleb posted a survey in the cafe about whether lacrosse should be a school sport. Students could choose whether or not to fill it out. What type of bias is this most likely to result in?
Voluntary response
400
A Nike representative wanted to check for defects in Nike sneakers sold in Baltimore area stores. She assumed the Nikes would be randomly distributed to different stores. She chose a 3 different stores and checked all of the Nikes in those stores. This is an example of what type of random sampling?
Cluster random sampling
400
The most common confidence interval used in statistical studies is what percent?
95%
400
I take my pulse every day for 5 days. It is 78, 84, 72, 91, and 75. Find the mean.
80
400
What is the darkest black (pigment) called?
Vantablack
500
CNHS gave a sample of Seniors a survey on relationships in which they were asked about their sexual activity. Students are required to put their name on the survey. What type of bias is this most likely to result in?
Non-response
500
Mr. Dingle wanted to find out what activities seniors were most interested in doing on their NYC trip. Rather than ask all seniors he assigned a number to each student and used a random number generator to select students for his sample. This is an example of what type of random sample?
SRS (Simple Random Sample)
500
A margin of error for a statistic is typically how far above and below a sample value.
+/- 2 standard deviations
500
Find the mean of the data set:
-4, -3, -1, 0, 0, 1, 1, 4, 5, 7
1
500
This food item is composed of celery salt, spices (including red pepper and black pepper), and paprika.
Old Bay
600
Mr. Dingle wanted to know if the students in his class wanted to play jeopardy. He asked the first 5 students to arrive in each of his classes one day. What type of bias is this most likely to result in?
Convenience
600
George wanted to find out who the most liked staff members at CNHS are. He assumed each grade might have different answers so he chose 10 random students from each grade to ask. This is an example of what type of random sampling?
Stratified random sampling
600
The thought process that allows you to use a sample statistic value to make judgments about the population parameter value. [to use samples to make claims about the population]
Inference
600
Explain the bias and variance of the following sample statistic if the true population value is 2:
High bias (low accuracy), Low variance
600
The official state sport of Maryland is ____________ . Not to be confused with the official team sport of Lacrosse.
Jousting