Exam (elaborations)
Stat 101 Exam 1 Questions And Answers Latest Update
- Course
- STAT 101
- Institution
- University Of Pennsylvania
Stat 101 Exam 1 Questions And Answers Latest Update
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Solution 2024/2025Pepper
Stat 101 Exam 1 Questions And Answers Latest
Update
Dataset ANS✔✔ How data is stored and presented, comprised of variables
measured on cases
Cases/ units ANS✔✔ what we obtain information about, makes up a row in a
dataset
Variable ANS✔✔ any characteristic that is recorded for each case, makes up
a column in a dataset
Categorical vs. Quantitative ANS✔✔ divides cases into groups
measures a numerical quantity for each case
Population vs. Sample ANS✔✔ includes all individuals or objects of interest
all the cases that we have collected data on (subset of the population)
Statistical inference ANS✔✔ the process of using data from a sample to gain
info using the population
, Solution 2024/2025
Pepper
Sampling Bias ANS✔✔ occurs when the method of selecting a sample
causes the sample to differ from the population in some relevant way,
cannot trust generalizations from sample to the population
Random samples vs. Non-random samples ANS✔✔ only way to really avoid
sampling bias, have averages that are centered around the correct number
may suffer from sampling bias, and averages may not be centered around
the correct number
Simple random sample ANS✔✔ each unit of the population has the same
chance of being selected, regardless of the other units chosen for the
sample
Volunteer bias ANS✔✔ letting people choose to participate
Explanatory variable ANS✔✔ independent variable
using one variable to help us understand values of another variable
shown on x-axis
Response variable ANS✔✔ dependent variable
using one variable to help us predict values of another variable
shown on y-axis
Associated vs. Causally associated ANS✔✔ values of one variable tend to be
related to values of the other variable
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