Straighterline Introduction to Statistics
quastions and answers A+ graded
Four steps in the process of statistics ️️1. Producing Data
2. Exploratory Data Analysis
3. Probability
4. InferenceCategorical variable ️️places individuals into one
of several groups
Two types: nominal and ...
Straighterline Introduction to Statistics
quastions and answers A+ graded
Four steps in the process of statistics ✔️✔️1. Producing Data
2. Exploratory Data Analysis
3. Probability
4. InferenceCategorical variable ✔️✔️places individuals into one
of several groups
Two types: nominal and ordinalQuantitative Variable
✔️✔️represents a measurement or a count
Two types: Interval and ratioNominal Variable ✔️✔️categorical
variables where there is no natural order among the
categoriesOrdinal variable ✔️✔️categorical variables where there
is natural order among the categoriesInterval 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 quanitityRatio 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
quantityWhat type of variable?:
eye color ✔️✔️nominalWhat type of variable?:
socioeconomic status with categories low, med, high
✔️✔️OrdinalWhat type of variable?:
Temperature ✔️✔️IntervalWhat type of variable?:
, Income ✔️✔️RatioVisual display and numerical summary for a
single categorical variable ✔️✔️pie chart or bar chart
and category percentagesVisual display and numerical summary
for a single quantitative variable ✔️✔️histogram or stemplot
and descriptive statisticsVisual display and numerical summary
for C->C ✔️✔️Two way table and conditional percentagesVisual
display and numerical summary for C->Q ✔️✔️Side by side box
plots and descriptive statisticsVisual 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,
99.7% (or virtually all) within 3 sdsInterquartile Range (IQR)
✔️✔️Middle 50% of the data
IQR= Q3-Q1Finding an outlier using IQR ✔️✔️An observation is
considered a suspected outlier if it is:
less than Q1 - 1.5(IQR), or
more than Q3 + 1.5(IQR).Interpreting scatterplots:
1. positive relationship displays as
2. negative relationship displays as ✔️✔️1. upward slope
2. downward slopeInterpreting Scatterplots:
How to tell if a linear relationship is strong or weak ✔️✔️closer to
-1 is a strong negative linear relationship
closer to +1 is a strong positive linear relationship
close to 0 is a weak linear relationshipInterpreting Scatterplots:
Linear regression ✔️✔️Finding the line that best fits the pattern of
the linear relationship (the line that describes how the response
variable linearly depends on the explanatory variableInterpreting
Scatterplots:
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller BestClass. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.99. You're not tied to anything after your purchase.
