Straighterline Introduction to Statistics Quiz (GRADED A) Questions and Answers (100% Verified Elaborations)

Straighterline Introduction to Statistics Quiz
(GRADED A) Questions and Answers (100%
Verified Elaborations)
Four steps in the process of statistics
1. Producing Data
2. Exploratory Data Analysis
3. Probability
4. Inference


Categorical variable
places individuals into one of several groups
Two types: nominal and ordinal




Quantitative Variable
represents a measurement or a count
Two types: Interval and ratio


Nominal Variable
categorical variables where there is no natural order among the categories


Ordinal variable
categorical variables where there is natural order among the categories


Interval Variable
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
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
nominal


What type of variable?:
socioeconomic status with categories low, med, high
Ordinal


What type of variable?:
Temperature
Interval


What type of variable?:
Income
Ratio


Visual display and numerical summary for a single categorical variable
pie chart or bar chart
and category percentages



Visual display and numerical summary for a single quantitative variable
histogram or stemplot
and descriptive statistics


Visual display and numerical summary for C->C
Two way table and conditional percentages


Visual display and numerical summary for C->Q
Side by side box plots and descriptive statistics


Visual display and numerical summary for Q->Q
Scatterplot and correlation coefficient (r)


Standard Deviation Rule
Approximately
68% of observations fall within 1 sd of the mean,
95% within 2 sd,