STA 2025-2026 Exam 1 questions well
answered to pass graded A+
Statistics - correct answer ✔✔the science of collecting, analyzing, interpreting,
and presenting data
Categorical - correct answer ✔✔data that is describing using words or categories,
qualitative
Quantitative - correct answer ✔✔data that is describing using numbers, can be
averaged
Graphical - correct answer ✔✔categorical and quantitative
Categorical - correct answer ✔✔bar charts (bars do not touch) and pie charts
Quantitative - correct answer ✔✔histograms (bars usually touch), stem plots, box
plots, and dot plots
Numerically - correct answer ✔✔center and spread
Center - correct answer ✔✔mean, median, mode
Mean - correct answer ✔✔the 'average', the balancing point, distances from the
data points always add up to zero
, Median - correct answer ✔✔the middle ordered value, the 50th percentile, falls in
(n+1)/2 position, always exactly 50% of the observations on either side of it and is
not very sensitive to outlier, robust
Mode - correct answer ✔✔the most frequently occurring number, the measure of
center represents the most common observations or class of observations
Spread - correct answer ✔✔range, variance, standard deviation, IQR
Range - correct answer ✔✔min-max, the measure of spread that is affected most
by outliers
Variance - correct answer ✔✔represents the 'typical' squared distance from the
mean, in squared units, measure of spread around the mean, but its units are not
the same as those of the data points
Standard deviation - correct answer ✔✔represents the 'typical' distance from the
mean, in units of data, measure of spread that is smaller for distributions where
the points are clustered around the middle, cannot be negative
IQR - correct answer ✔✔interquartile range, Q3-Q1 where Q3= 75th percentile
(the median of the 'top' half) and Q1= 25th percentile (the median of the 'bottom'
half), gives the spread of the central (middle) 50% of the data set
Outliers - correct answer ✔✔any observations that are significantly far away from
the rest of the data points
answered to pass graded A+
Statistics - correct answer ✔✔the science of collecting, analyzing, interpreting,
and presenting data
Categorical - correct answer ✔✔data that is describing using words or categories,
qualitative
Quantitative - correct answer ✔✔data that is describing using numbers, can be
averaged
Graphical - correct answer ✔✔categorical and quantitative
Categorical - correct answer ✔✔bar charts (bars do not touch) and pie charts
Quantitative - correct answer ✔✔histograms (bars usually touch), stem plots, box
plots, and dot plots
Numerically - correct answer ✔✔center and spread
Center - correct answer ✔✔mean, median, mode
Mean - correct answer ✔✔the 'average', the balancing point, distances from the
data points always add up to zero
, Median - correct answer ✔✔the middle ordered value, the 50th percentile, falls in
(n+1)/2 position, always exactly 50% of the observations on either side of it and is
not very sensitive to outlier, robust
Mode - correct answer ✔✔the most frequently occurring number, the measure of
center represents the most common observations or class of observations
Spread - correct answer ✔✔range, variance, standard deviation, IQR
Range - correct answer ✔✔min-max, the measure of spread that is affected most
by outliers
Variance - correct answer ✔✔represents the 'typical' squared distance from the
mean, in squared units, measure of spread around the mean, but its units are not
the same as those of the data points
Standard deviation - correct answer ✔✔represents the 'typical' distance from the
mean, in units of data, measure of spread that is smaller for distributions where
the points are clustered around the middle, cannot be negative
IQR - correct answer ✔✔interquartile range, Q3-Q1 where Q3= 75th percentile
(the median of the 'top' half) and Q1= 25th percentile (the median of the 'bottom'
half), gives the spread of the central (middle) 50% of the data set
Outliers - correct answer ✔✔any observations that are significantly far away from
the rest of the data points
