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ISDS exam 1 questions with complete solutions 2024/2025
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ISDS exam 1 questions with complete solutions 2024/2025 descriptive statistics - ANSWERScollecting, organizing, and presenting the data inferential statistics - ANSWERSdrawing conclusions about a population based on sample data from that population population - ANSWERSconsists of all ite...

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  • September 16, 2024
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  • 2024/2025
  • Exam (elaborations)
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  • isds exam 1 questions with complete solutions 2024

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ISDS exam 1 questions with complete
solutions 2024/2025

descriptive statistics - ANSWERScollecting, organizing, and presenting the data



inferential statistics - ANSWERSdrawing conclusions about a population based on sample data from that
population



population - ANSWERSconsists of all items of interest



sample - ANSWERSa subset of the population



sample statistic - ANSWERScalculated from the sample data and is used to make inferences about the
population parameter



cross-sectional data - ANSWERSdata collected by a characteristic of many subjects at the same point in
time, or without regard to differences in time



time series data - ANSWERSdata collected by recording a characteristic of a subject over several time
periods



variable - ANSWERSthe general characteristic being observed on an object of interest



qualitative - ANSWERSgender, race, political affiliation



quantitative - ANSWERStest scores, age, weight (discrete, continuous)



discrete - ANSWERSvariable assumes a countable number of distinct values (ex. number of children in a
family, number of points scored in a basketball game)

, continuous - ANSWERSvariable can assume an infinite number of values within some interval (ex. weight,
height, investment return)



nominal scale - ANSWERSdata are simply categories for grouping the data



ordinal scale - ANSWERSthere is no objective way to interpret the difference between instructor quality
(ex. instructors are evaluated by excellent, good, fair, poor)



interval scale - ANSWERSno absolute 0 or starting point defined



ratio scale - ANSWERSdata may be categorized and ranked, there is an absolute 0 (ex. weight, time,
distance)



frequency distribution - ANSWERSfor qualitative data, groups data into categories and records how many
observations fall into each category



relative frequency - ANSWERScalculate by dividing each category's frequency by the sample size



cumulative frequency distribution - ANSWERSspecifies how many observations fall below the upper limit
of a particular class



relative frequency distribution - ANSWERSidentifies the proportion or fraction of values that fall into
each class



cumulative relative frequency distribution - ANSWERSgives the proportion or fraction of values that fall
below the upper limit of each class



histogram - ANSWERSa visual representation of a frequency or relative frequency distribution (bar graph)



polygon - ANSWERSa visual representation of a frequency or a relative frequency distribution (line graph
that starts and ends on y axis)

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