STA20006 Analysis of Variance & Regression Assignment (Part 2) HS1 2025

Introduction 

The objective of this assignment is for you to understand research scenarios that concern analysis of variance (ANOVA). In particular, you must master the different types of ANOVA, such as single-factor and factorial. It is highly recommended that you attempt the assignment questions every week, where possible (after completing each module), so that the information is still fresh and does not become overwhelming if you leave it to the last minute.

Recommended timeline of assignment tasks:

• Task A | after completing module 6 & 7: Introduction to ANOVA & Multiple Comparisons
• Task B | after completing module 8: Factorial ANOVA Part I
• Task C | after completing module 9: Factorial ANOVA Part II 

To complete these tasks, it is highly recommended that you attend all of the lectures and tutorial sessions and complete the accompanying activities/questions. If you have any queries, require an extension, or have any other related issues, please contact the unit convenor first.

Submission: 

Assignments are to be submitted via CANVAS on or before the due date. Students are expected to submit the assignments as a pdf document. The file name should be of the form Surname_Firstname_Assignment2.pdf. 

SPSS Output: 

Unless specifically asked for in the question, all SPSS output should be placed as an Appendix at the back of your assignment submission (see Answer Sheet).

Plagiarism and Maintaining Academic Integrity: 

This is an individual assignment, so you are expected to complete it by yourself. You must demonstrate good Academic Integrity by ensuring that your assignment work is entirely your own, because this shows that you have understood what you have learnt. You should not work with anyone else (including another student) on this assignment. Whilst you may seek help if there is anything about this assignment you do not understand, the assignment should be your own written work in your own words only. 

Do not copy any wording from any source, including (but not limited to) websites, textbooks, class material (such as lecture notes), Google Translate (or similar translation websites/apps/programs). Use of generative AI such as ChatGPT is not permitted. Any form of copying or submitting work that is not entirely done by you is a breach of academic integrity and could attract academic penalties. Your work will be checked for breaches of academic integrity. 

STA20006 Assessment Task 

A good amount of sleep per day has the potential to predispose infants to better growth by fostering better energy self-regulation. Newborns and babies sleep differently from older children and adults. It is normal for babies to sleep in short bursts and to wake up multiple times during the night. Sleep-deprived parents look for solutions to help their babies sleep longer. 

Cry it out -also known as the extinction method is a sleep technique that involves putting a baby to sleep by placing them in a cot and allowing them to fuss and cry until they fall asleep on their own without the parents' help. The parent does not go back to the room to comfort the baby. 

Controlled crying -a sleep training technique that involves putting the baby to bed and then leaving the room. If they cry, the parent returns to the room after a short period and comforts the baby, and then leaves the room again. 

Co-sleeping- when parents sleep in the same bed with their babies, is called co-sleeping. Parents may choose to co-sleep for many reasons, including cultural reasons. Experts recommend against co-sleeping because it can increase the risk of sudden unexpected death in infancy (SUDI). However, there are many reasons why parents choose to co-sleep. For example, many parents who sleep with their babies believe that it helps their baby feel safe and secure. Some parents co-sleep because they find it more practical. Breastfeeding and re-settling during the night can be easier. 

Consider a study in which researchers were interested in examining the number of hours babies sleep over 24 hours. The study pertains to 120 babies (aged approx. 24 months). Each baby had a variety of physical and cognitive variables measured (see table below). In addition, the babies'parents were interviewed to ascertain the sleeping method utilised when the child was between 6 months and 18 months.