Exam (elaborations)

STRAIGHTERLINE INTRODUCTION TO STATISTICS (BRAND NEW) ACTUAL EXAM|STRAIGHTERLINE INTRODUCTION TO STATISTICS VERIFIED EXAM QUESTIONS WITH DETAILED CORRECT ANSWERS ALL RATED A+|GUARANTEED SUCCESS|LATEST UPDATE |

0 purchase

Course
STRAIGHTERLINE INTRODUCTION TO STATISTICS

Institution
STRAIGHTERLINE INTRODUCTION TO STATISTICS

[Show more]

Preview 3 out of 18 pages

View example

Uploaded on October 4, 2024
Number of pages 18
Written in 2024/2025
Type Exam (elaborations)
Contains Questions & answers

brand new actual exam
verified exam questions
detailed correct answers
all rated a
guaranteed success
latest update 2024
straighterline introduction to statistics

Institution STRAIGHTERLINE INTRODUCTION TO STATISTICS
Course STRAIGHTERLINE INTRODUCTION TO STATISTICS

BRILLIANTSOLUTIONS Member since 1 year 16 documents sold

$13.49

Add to cart

Add to wishlist

100% satisfaction guarantee
Immediately available after payment
Both online and in PDF
No strings attached

STRAIGHTERLINE INTRODUCTION TO STATISTICS
(BRAND NEW) ACTUAL EXAM|STRAIGHTERLINE
INTRODUCTION TO STATISTICS VERIFIED EXAM
QUESTIONS WITH DETAILED CORRECT ANSWERS
ALL RATED A+|GUARANTEED SUCCESS|LATEST
UPDATE 2024-2025|

Four steps in the process of statistics - ANSWER-✅1. Producing Data
2. Exploratory Data Analysis
3. Probability
4. Inference

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

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

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

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

Interval Variable - 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 - 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 - ANSWER-✅nominal

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

What type of variable?:

,Temperature - ANSWER-✅Interval

What type of variable?:
Income - ANSWER-✅Ratio

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

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

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

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

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

Standard Deviation Rule - 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) - ANSWER-✅Middle 50% of the data
IQR= Q3-Q1

Finding an outlier using IQR - ANSWER-✅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 - ANSWER-✅1. upward slope
2. downward slope

Interpreting Scatterplots:
How to tell if a linear relationship is strong or weak - ANSWER-✅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 relationship

Interpreting Scatterplots:

, Linear regression - ANSWER-✅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 variable

Interpreting Scatterplots:
Least Squares Regression Line - ANSWER-✅Has the smallest sum of squared vertical
deviations of the data points from the line.

Interpreting Scatterplots:
Extrapolation - ANSWER-✅Prediction for ranges of the explanatory variable that are
not in the data; is not reliable and should be avoided

Association (does/does not) imply causation. - ANSWER-✅Does not

Lurking Variable - ANSWER-✅a variable that is not among the explanatory or
response variables in a study, but could substantially affect your interpretation of
the relationship among those variables

Simpson's paradox - ANSWER-✅When a lurking variable causes you to rethink the
direction of an association

Probability sampling plan - ANSWER-✅any sampling plan that relies on random
selection (avoids bias).

Simple Random Sampling - ANSWER-✅Every member of the population has an
equal probability of being selected for the sample

Cluster Sampling - ANSWER-✅Used when the population is naturally divided into
groups. Take a random sample of clusters and use all individuals within those
clusters as the sample.

Stratified sampling - ANSWER-✅Used when the population is naturally divided into
sub-populations called stratum. Choose a simple random sample from each stratum
and use these together as the sample.

Multistage sampling - ANSWER-✅a probability sampling technique involving at least
two stages: a random sample of clusters followed by a random sample of people
within the selected clusters

Observational study - ANSWER-✅values of the variable or variables of interest are
recorded as they naturally occur; no interference

Sample surveys - ANSWER-✅a particular type of observational study in which
individuals report variables' values themselves, frequently by giving their opinions.

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 BRILLIANTSOLUTIONS. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $13.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

67479 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling

Exam (elaborations)

STRAIGHTERLINE INTRODUCTION TO STATISTICS (BRAND NEW) ACTUAL EXAM|STRAIGHTERLINE INTRODUCTION TO STATISTICS VERIFIED EXAM QUESTIONS WITH DETAILED CORRECT ANSWERS ALL RATED A+|GUARANTEED SUCCESS|LATEST UPDATE |

Document information

Subjects

Written for

Seller

Reviews received

Content preview