Straighterline Introduction to
Statistics
Four steps in the process of statistics - ✔✔ correct answer 1. Producing Data
2. Exploratory Data Analysis
3. Probability
4. Inference
Categorical variable - ✔✔ correct answer places individuals into one of several groups
Two types: nominal and ordinal
Quantitative Variable - ✔✔ correct answer represents a measurement or a count
Two types: Interval and ratio
Nominal Variable - ✔✔ correct answer categorical variables where there is no natural order among
the categories
Ordinal variable - ✔✔ correct answer categorical variables where there is natural order among the
categories
Interval Variable - ✔✔ correct answer a measurement or count for which it makes sense to talk
about the difference between values, but it does not make sense to talk about the ratio between
values; 0 does not represent the absence of quanitity
Ratio Variable - ✔✔ correct answer quantitative variables for which it makes sense to talk about the
difference between values AND the ratio between values; 0 represents the absence of quantity
What type of variable?:
eye color - ✔✔ correct answer nominal
What type of variable?:
socioeconomic status with categories low, med, high - ✔✔ correct answer Ordinal
What type of variable?:
, Straighterline Introduction to
Statistics
Temperature - ✔✔ correct answer Interval
What type of variable?:
Income - ✔✔ correct answer Ratio
Visual display and numerical summary for a single categorical variable - ✔✔ correct answer pie chart
or bar chart
and category percentages
Visual display and numerical summary for a single quantitative variable - ✔✔ correct answer
histogram or stemplot
and descriptive statistics
Visual display and numerical summary for C->C - ✔✔ correct answer Two way table and conditional
percentages
Visual display and numerical summary for C->Q - ✔✔ correct answer Side by side box plots and
descriptive statistics
Visual display and numerical summary for Q->Q - ✔✔ correct answer Scatterplot and correlation
coefficient (r)
Standard Deviation Rule - ✔✔ correct answer Approximately
68% of observations fall within 1 sd of the mean,
95% within 2 sd,
99.7% (or virtually all) within 3 sds
Interquartile Range (IQR) - ✔✔ correct answer Middle 50% of the data
IQR= Q3-Q1
Finding an outlier using IQR - ✔✔ correct answer An observation is considered a suspected outlier if
it is:
Statistics
Four steps in the process of statistics - ✔✔ correct answer 1. Producing Data
2. Exploratory Data Analysis
3. Probability
4. Inference
Categorical variable - ✔✔ correct answer places individuals into one of several groups
Two types: nominal and ordinal
Quantitative Variable - ✔✔ correct answer represents a measurement or a count
Two types: Interval and ratio
Nominal Variable - ✔✔ correct answer categorical variables where there is no natural order among
the categories
Ordinal variable - ✔✔ correct answer categorical variables where there is natural order among the
categories
Interval Variable - ✔✔ correct answer a measurement or count for which it makes sense to talk
about the difference between values, but it does not make sense to talk about the ratio between
values; 0 does not represent the absence of quanitity
Ratio Variable - ✔✔ correct answer quantitative variables for which it makes sense to talk about the
difference between values AND the ratio between values; 0 represents the absence of quantity
What type of variable?:
eye color - ✔✔ correct answer nominal
What type of variable?:
socioeconomic status with categories low, med, high - ✔✔ correct answer Ordinal
What type of variable?:
, Straighterline Introduction to
Statistics
Temperature - ✔✔ correct answer Interval
What type of variable?:
Income - ✔✔ correct answer Ratio
Visual display and numerical summary for a single categorical variable - ✔✔ correct answer pie chart
or bar chart
and category percentages
Visual display and numerical summary for a single quantitative variable - ✔✔ correct answer
histogram or stemplot
and descriptive statistics
Visual display and numerical summary for C->C - ✔✔ correct answer Two way table and conditional
percentages
Visual display and numerical summary for C->Q - ✔✔ correct answer Side by side box plots and
descriptive statistics
Visual display and numerical summary for Q->Q - ✔✔ correct answer Scatterplot and correlation
coefficient (r)
Standard Deviation Rule - ✔✔ correct answer Approximately
68% of observations fall within 1 sd of the mean,
95% within 2 sd,
99.7% (or virtually all) within 3 sds
Interquartile Range (IQR) - ✔✔ correct answer Middle 50% of the data
IQR= Q3-Q1
Finding an outlier using IQR - ✔✔ correct answer An observation is considered a suspected outlier if
it is:
