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Stast 1602 Exam 1 Introduction To Data Science With Python 2025 Questions With Right Answe, Exams of Advanced Data Analysis

Stast 1602 Exam 1 Introduction To Data Science With Python 2025 Questions With Right Answers Verified A+ 100 %

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2024/2025

Available from 07/11/2025

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Stast 1602 Exam 1 Introduction To Data
Science With Python 2025 Questions
With Right Answers Verified A+ 100 %
What comprises data analysis?
Exploration (identifying patterns), prediction (making informed guesses), inference (Will the patterns
appear in new observations? How accurate?)
What is the data science work flow?
Import->tidy->transform->visualize->model->communicate
What is an observational study?
Study in which investigators have no control over how data were generated
What are individuals?
Items under study
What is a treatment?
Factor we believe may cause some effect
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Download Stast 1602 Exam 1 Introduction To Data Science With Python 2025 Questions With Right Answe and more Exams Advanced Data Analysis in PDF only on Docsity!

Stast 1602 Exam 1 Introduction To Data

Science With Python 2025 Questions

With Right Answers Verified A+ 100 %

What comprises data analysis?

Exploration (identifying patterns), prediction (making informed guesses), inference (Will the patterns appear in new observations? How accurate?)

What is the data science work flow?

Import->tidy->transform->visualize->model->communicate

What is an observational study?

Study in which investigators have no control over how data were generated

What are individuals?

Items under study

What is a treatment?

Factor we believe may cause some effect

What is an outcome?

Measured on each individual; manifestation of effect

How do you establish causality?

Observe an association then perform analysis that supports a causal relationship

What is a confounding factor?

Factor that causes treatment and control group to be systematically different

How to avoid confounding factors?

Assign individuals to treatment and control at random; do RCT

What is a RCT?

Randomized controlled trial; study that randomly assigns individuals to treatment or control; but take more resources and must take ethics into account; to establish causality

When is there an association between a treatment and outcome?

If there is a systematic difference in outcomes of treatment and control group

What is comparison?

What is output of type(1<2)?

Bool

What is a float?

Number with decimal

What is an int?

Whole number

What is a str?

String; text

What is output of "a"+"t"?

at

What does str( ) do?

Returns a string representation of its argument

What is output of str(2+1)?

3 (as a str instead of int)

What are boolean values?

Represent truth of statement as either True or False

What does bool( ) do?

Tests object for its truth value; by default objects are True unless defined to be False; False=0, True=

What are boolean comparison operators?

,<,==, is

What are boolean operators?

And, or, not

What is output of True or 2?

True

What is a python statement?

Single line of code that either returns a value or causes something to happen

What is the relation between expressions and statements?

Any expression is a statement but not every statement is an expression

What is a table?

Collection of data stored in rows and columns; each column is a numpy array

What does Table( ) do?

Creates empty table

What is a method?

Function associated with an object

What is an attribute?

Variable associated with an object

What is a property?

Special type of method that doesn't need to be called with ( ) after the name

What does num_columns do?

Returns number of columns in table it refers to

What is an array?

Sequence type- ordered and can refer to particular member by its relative position

What does make_array( ) do?

Makes an array

What is output of make_array('a','b','y','z')?

a,b,y,z

What is an index?

Relative position of a member of an array

What to start counting from when determining relative position?

What does array.item(3) do?

Outputs 4th item in array

What is output of table.column(0).item(3)?

Creates array of column 0 and outputs 4th item

What is a variable?

Feature or characteristic thats varies from individual to individual

What is a quantitative variable?

Variable that assumes numerical values to do arthmatic

What does tab.scatter('col1','col2' ) do?

Creates scatter plot od points with coordinates (a.b) of values in columns 1 and 2 of table

What does tab.scatter( ) do?

Makes 1 point for each row of table named tab

What does tab.plot('1','2') do?

Produces line plot with points coordinates (a,b) of columns 1 and 2; used to plot relationships over time

What are categorical variables?

Can't do arithmetic with them

What are frequencies?

Number of observations that fall in each category of variable

What is a distribution table?

Table of frequencies of categories

What does tab.barh('1','2') do?

Produces horizontal bar chart with 1 bar for variable 1

What does tab.group('1') do?

Produces new table with columns 1 and count (frequency of each category in 1)

What does tab.relabel('old_name','new_name') do?

Creates crave with 1 on horizontal axis divided into 10 bins;bars are of area proportional to number of observations in each bin

What is the area of a bar in a histogram?

Area=% of entries in bin= height of bar*width of bar; sum of all bar areas=100%

What is the vertical value in a histogram?

Percent of observations in bin relative to width of bin; bar height=area/width=%entries in bin/width=density

What is the total area of a histogram?

1

What does tab.hist('1',bins=make_array(...)) do?

Customizes histograms number and width of bins

How to make function?

def func_name(thing):

variable=thing.action()

return ...

func_name(object)

What does tab.apply(name_func, 'column') do?

Applies the function name_func to column in tab

What does tab.group('column', max) do?

Makes table with rows grouped by column, first column is column and second column is column max