Erd diagram

The goal of the project is to implement a “prototype” database system application / ERD diagram for an eCommerce social-network system called UCOnline where users can explore information about books/music/software, rate your purchase, identify purchase price and see ratings of their friends.

 The project will require you to complete the assignment individually. Below you will find the ERD deliverable requirements. There are two parts to the assignment. You must create a diagram using a diagramming tool AND provide a written text-based document explaining your relationship mapping (systems analysis use case document). The assignment is worth 200 points. See rubric for grading scheme. 

BUSINESS REQUIREMENTS ACROSS ALL ASSIGNMENTS

You will work with book/music/media information, user information, ratings of books, and users’ social network

Each book has an id, title, publication date, publisher, ISBN, functional category, page count, price (publisher), and product description

There are 3 categories of book: fiction, non-fiction, and specialty

There are 2 categories of music: digital and media-based

An author can write one or more books.

A musician can be a solo artist, part of a group, or both

An author can also be associated with one or more publishers.

A musician/group/act can be associated with one or more music houses

An author’s book can have one or more editions.

A song and or album can have more than one version/edition (i.e. EP, LP, CD, DVD etc)

A publisher can have many authors and many books.

A record company can have many artists associated and many albums associated with it. 

A record company can also be the publishing company (i.e. self-publishing)

Many ISBNs can also be associated with a given publisher but only one ISBN per form of medium (ie the ISBN is the PK no matter what).

An author can write many books.

An artist can write many songs, albums etc.

UCOnline needs to keep track of user ratings for each item sold in the online store (e.g., 1-5 and 1 for ‘Dislike’, to 5, for ‘Awesome!’).

A particular user rates a particular item at a given time.

A user CANNOT rate the same multiple times unless there are multiple editions of the item. Each edition can be rated separately.

Each user who submits a rating will be identified by a unique id and has a name, gender, age, and location. Nothing is anonymous.

There is also a social network between users. Users can send communication requests (i.e. instant messages/emails) to other users. Such requests can be accepted or ignored. Once accepted, the two users are considered ‘book buddies.’ If ignored, the user can send the request again. We want to add a store when the requests were sent (timestamp), the result of the requests and when the request was answered (timestamp).

MScin Foundations of Data Science University of Hertfordshire

Maths Competition

Description:

In this competition, each group needs to finish the following two tasks:

Task 1.

Consider the function 𝑓𝑋(𝑥) = {
4 + 𝑥 − 5𝑥2 if 0 ≤ 𝑥 ≤ 1

0 otherwise

Is there a random variable 𝑋 which has this as its density?
• You must show your justification.

• If your answer is Yes, then you need to compute the expected value of 𝑋, that is 𝐸(𝑋).
• If your answer is No, then you need to give a solution to remedy the function 𝑓𝑋(𝑥) so

that there is a random variable 𝑋 which has it (the remedied function) as its density.

Task 2.

Your task is to generate a question to test if a student understands one of the two concepts in

the following bullet points and provide your solution to the question. You are free to choose

which one you want to work on. You must show how the question is generated via the Group

Discussions page. The question should inspire others to think about it and should help other

students to understand the concept.

Through this task, you will develop your ability to ask mathematical questions. “Without

questions, there would be no mathematics, and unless students learn to ask questions, they

cannot operate as mathematicians.” [1].

• Given the definition of derivative as follows [2],

what mathematical question can you ask?

• Given the definition of definite integral as follows [3],

what mathematical question can you ask?

Timeline

Noon 18/12/2020 final submission deadline.

Submission Instruction

1. Each group prepares one and only one submission.

2. The submission including solutions to those two tasks should be a PDF file.

3. The submission should be done via Canvas.

Evaluation

Submissions will be judged by a panel consisting of 3 tutors: Emil Dmitruk, Felix Riegler and

Agnes Bonivart, with Emil Dmitruk being the chair, based on the following criteria:

1. Group collaboration: Do group members participate actively? Are discussions within the

group supportive and efficient?

2. Correctness of your solution to Task 1.

3. Quality of Task 2: whether the proposed question is valid and inspiring to others, and

whether the provided answer is correct.

4. Clarity of the writing.

The panel will announce the result on 08/01/2021.

References

1. C. Foster: Student-Generated Questions in Mathematics Teaching, Mathematics Teacher, 105 (1):

26-31, 2011.

2. Credit: https://tutorial.math.lamar.edu/classes/calci/defnofderivative.aspx

3. Credit:

https://tutorial.math.lamar.edu/classes/calci/defnofdefiniteintegral.aspx#:~:text=The%20definite%

20integral%20is%20defined,notation%20for%20an%20indefinite%20integral.

https://tutorial.math.lamar.edu/classes/calci/defnofderivative.aspx

https://tutorial.math.lamar.edu/classes/calci/defnofdefiniteintegral.aspx#:~:text=The%20definite%20integral%20is%20defined,notation%20for%20an%20indefinite%20integral

https://tutorial.math.lamar.edu/classes/calci/defnofdefiniteintegral.aspx#:~:text=The%20definite%20integral%20is%20defined,notation%20for%20an%20indefinite%20integral