stat 121 Questions and Correct Answers/ Latest Update / Already Graded

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stat 121 Questions and Correct Answers/
Latest Update / Already Graded
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
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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


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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

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