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STA 270 Exam -1 Questions and Complete Solutions Graded A+. $14.49   Add to cart

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STA 270 Exam -1 Questions and Complete Solutions Graded A+.

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  • Statistics STA

STA 270 Exam -1 Questions and Complete Solutions Graded A+.

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  • November 4, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Statistics STA
  • Statistics STA
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STA 270 Exam #1
Questions and Complete
Solutions Graded A+
Statistics - Answer: the scientific discipline that provides methods to help us make sense of data



Variable - Answer: any characteristic whose value may change from individual or object to another ex.
weight, height, IQ...



Population - Answer: the entire collection of individuals or objects above which information is desired



Sample - Answer: a subset of the population selected for study



Descriptive Statistics - Answer: a branch of statistics that includes methods for organizing and
summarizing data



Inferential Statistics - Answer: a branch of statistics that involve generalizing from a sample to a
population from which the sample was selected and assessing the reliability of such generalization



Categorical Data - Answer: classified into categories ex. hair color



Nominal - Answer: order is not important, one is not better than the other ex. gender



Ordinal - Answer: order is important ex. letter grade, marathon results



Numerical Data - Answer: measured on a numerical scale ex. GPA, height

, Discrete - Answer: distinct values with gaps in between ex. # of siblings, GPA



Continuous - Answer: takes any value in an interval on a number line, there are no gaps between
possible values ex. time, weight, age



Univariate - Answer: collect observations from a single variable ex. height



Multivariate - Answer: collect observations from 2 or more variables ex. height & weight & age



Bivariate - Answer: collect observations from 2 variables, special multivariate data set ex. height &
weight



Data - Answer: observations made on either a single variable or simultaneously on two or more variables



Observational Study - Answer: interested in answering questions about characteristics of a population or
comparing such characteristics in two or more well-defined populations ex. determining whether gender
and attitude toward abortion are related



Experimental Study - Answer: interested in answering questions such as "what is the effect of...?" "what
happens when...?"



Selection Bias - Answer: intentionally leave out certain parts of the population bias as a result of
systematic exclusion of some part of the population ex. conducting a survey of NAU students only on the
south campus



Measurement/Response Bias - Answer: bias as a result of the method of observation tends to produce
values that differ from the true value ex. the tendency of people not to be completely honest when
asked in person about illegal behavior or unpopular beliefs



Non-response Bias - Answer: bias as a result of data not obtained from all individuals in the sample

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