Stat 4800 Assignment 3 [Total 15 Marks] - Summer 2020

Due @ BrightSpace, 11:30 PM, Sunday, 05 July 2020

Save your work into a single

PDF

file and submit it on BrightSpace.

Include your

name and ID

on

of top of the first page.

Q1. [6 marks]

The data set "S4800 HW3 Q1 Data.xlsx" provides the information of four key

categorical attributes for each of the 2201 people on board the Titanic when it struck an iceberg

and sank. The attributes are social class (

Class

; first class, second class, third class, or

crewmember), age (

Age

; adult or child), sex (

Sex

; male or female), and whether or not the

person survived (

Survived

; yes or not). Consider the variable

Survived

as the dependent

variable and the variable

Class

as the independent variable.

a) Use StatGraphics to produce a two-way table with Class as the column variable and Survived

as the row variable. Make sure it

only

contains observed frequency and the expected frequency.

b) Use StatGraphics to produce a side-by-side bar graph with Survived on the x-axis.

c) Use StatGraphics to produce the Tests of Independence output, showing the value of chi-

square statistic and degrees of freedom.

1

a) Can we conclude that different social classes have different survival rates? Make sure you use

the three-step process and an appropriate decision point to answer this question.

And provide the

answer in layman's term. [5]

b) Can we conclude that there are more people from the "

crewmember"

class did not survive?

Briefly justify your answer. 0 mark is no justification. [