STAT 121 Questions Verified Answers Latest Update
2025
The purpose of statistics is - ANS to convert data into useful information
population - ANS group we want to stdy to study
the four steps in stats - ANS Produce data, Exploratory data analysis, Probability, Inference
Sample - ANS sub-group of the population
Sample preferred over population - ANS less expensive, less time consuming, collecting data of
population is impossible
stat info is - ANS misleading and misinterpreted
All stats summaries and conclusions should be reported - ANS in context
stat problem solving process - ANS collecting data, summarizing data, interpreting data
probability - ANS the way that we are allowed to draw conclusions about the population based
on the data of the sample
individual - ANS the person or object we are the doing the study on
pie charts can be use to visualize - ANS categorical data but bar graphs are preferred
advantage of a histogram over a stem/dot plot - ANS works well for large data sets
, shape center spread have __ meaning for bar graphs - ANS no
mu - ANS population mean
M - ANS median
s - ANS sample standard deviation
x-bar - ANS sample mean
p - ANS population proportion
p-hat - ANS sample proportion
sigma - ANS population standard deviation
finding median - ANS put the data in order to smallest to largest, odd middle number, even take
average
Q1 - ANS mean of the first half
Q3 - ANS mean of the second half
IQR - ANS Q3 - Q1
Mean compared to the median - ANS The mean follows the tail.
2025
The purpose of statistics is - ANS to convert data into useful information
population - ANS group we want to stdy to study
the four steps in stats - ANS Produce data, Exploratory data analysis, Probability, Inference
Sample - ANS sub-group of the population
Sample preferred over population - ANS less expensive, less time consuming, collecting data of
population is impossible
stat info is - ANS misleading and misinterpreted
All stats summaries and conclusions should be reported - ANS in context
stat problem solving process - ANS collecting data, summarizing data, interpreting data
probability - ANS the way that we are allowed to draw conclusions about the population based
on the data of the sample
individual - ANS the person or object we are the doing the study on
pie charts can be use to visualize - ANS categorical data but bar graphs are preferred
advantage of a histogram over a stem/dot plot - ANS works well for large data sets
, shape center spread have __ meaning for bar graphs - ANS no
mu - ANS population mean
M - ANS median
s - ANS sample standard deviation
x-bar - ANS sample mean
p - ANS population proportion
p-hat - ANS sample proportion
sigma - ANS population standard deviation
finding median - ANS put the data in order to smallest to largest, odd middle number, even take
average
Q1 - ANS mean of the first half
Q3 - ANS mean of the second half
IQR - ANS Q3 - Q1
Mean compared to the median - ANS The mean follows the tail.
