Study Types
Name the type of study where you ask people questions and record their responses.
Survey
Variables that are typically integers representing a count of objects.
Discrete variables
What sampling method involves asking the first 20 people that walked past you to take your survey.
Convenience sample
What is the MEDIAN of the following numbers: 1, 2, 3, 6, 8?
3 (the middle number)
Is Prob & Stats a required class to graduate from DCPS high school?
No. You have other choices for your "upper level math" class.
Name the type of study where you split the population into groups, treat the groups differently, and record the outcomes.
Experimental study
Categorical data such as "What is your favorite movie?"
Nominal
The ideal type of sample where each member of the population has an equal likelihood of being selected
Simple random sample
What is the MEAN of the following numbers: 1, 2, 3, 6, 8?
4 (the average)
Write a BAD survey question.
(Something misleading or biased like "Do you think I am stupid?")
You stand outside the lunchroom and count how many students get in line each day. What study type is this?
Observational Study
Type of data representing heights of individuals.
Continuous
Type of sample that involves selecting the 10th, 20th, 30th, etc. person who walks past you on the street.
Systematic sample
What is the RANGE of the following numbers: 1, 2, 3, 6, 8?
7 (biggest minus smallest)
Finish this quote: “There are three kinds of lies: lies, damned lies, and _________”
statistics. (Quote by Mark Twain)
You want to test whether a new drug is more effective at treating COVID than an older drug. What type of study should you conduct?
Experimental study
Give an example of Ordinal data.
Data that has a logical order (grades from A to F, finishes in a race, etc.)
Type of sample that involves separating the population into groups and randomly selecting a few entire groups.
Cluster random sample
What is the MODE of the following numbers: 1, 2, 3, 6, 8?
There is no mode because each number appears only once.
What are the three main types of research studies?
Surveys, Observational Studies, and Experiments
Give an example of an observational study.
(Collecting data only by watching or observing)
Give an example of data that is reported as a number but is actually categorical.
Zip code, Phone #, Social Security #, etc.
Give an example of a Stratified Random Sample.
Random select the same number of people from each different subgroup.
Give an example of a dataset that has TWO modes.
2, 2, 3, 5, 5 (there are two 2s and two 5s)
Why are more people bitten by sharks on days when a lot of ice cream is sold?
Because both happen when it's hot out