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STAT 121 Questions Verified Answers Latest Update 2025

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Institution STAT 121

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STAT 121 Questions Verified Answers Latest Update 2025

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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.

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