A set of interconnected parts that you can draw a boundary around (physical or imaginary). A system depends on how you define it.
200
What is the range of a data set?
The largest number minus the smallest number (or, the smallest number subtracted from the biggest number).
200
What does "univariate" mean?
A data set with one variable
200
How is causation different from correlation?
Causation means that the x variable CAUSES the y variable to change, while correlation means that there is a linear relationship on a graph between two variables.
200
What is an observational study?
When variables are observed and data is gathered but no attempt is made to influence the outcome
300
What is the point of optimization?
To find the best solution that will require the least amount of resources (time, material, etc.)
300
How do you find the average of a data set?
Add up all the numbers in a data set and then divide by the total number of values.
300
What does "bivariate" mean?
A data set with two variables
300
Which R value shows the strongest correlation: 0.9, 0.5, -1, -0.7?
-1
300
What is a sample survey?
When information is collected from a portion of the population
400
What do industrial engineers do?
Use optimization to find the best possible solution for the movement of people, objects, or information.
400
Find the median of the following data set:
20 21 19 18 22 31 29 46 21 24
21.5
400
You want to see what Black Friday stores are the most popular. You go to the mall and collect data on how many people go to different stores on Black Friday. What type of data have you collected?
Univariate
400
If the correlation coefficient is 0.9, what is the coefficient of determination?
0.81
400
How do we test for causation?
By doing an experiment
500
You are Black Friday shopping and you only have $20 left to spend. You want to buy presents for yourself and for your family. You know which stores you want to shop at and you have plenty of time left to shop. What are you trying to optimize?
The amount of money you have to spend.
500
Find the mean of the following data set:
20 21 19 18 22 31 29 46 21 24
25.1
500
You want to see how age affects the amount of food that people eat. You write down the ages of all your family members at thanksgiving and record how much food they eat at dinner (measured in pounds). What type of data are you collecting?
Bi variate
500
Ms. Rodriguez will show you a graph. Estimate the correlation coefficient of this graph.
About 0.7 (Range from 0.55 to 0.8 would be acceptable)
500
A Speer student decides to see how studying affects the test scores of the sophomore class. This student takes two different groups and gives one group a study plan and tells one group not to study. After one week, each group is given the same test and results are analyzed. What method of data collection is this?