STATS Project

By: Amber Meadows and Taylor Spiva

Study One-Sleep Patterns, Sleep Problems and Associations with Reported Sleep Quality in Chinese School-Aged Children

Lurking Variables

There were a few lurking variables in this study.


- One of them being whether the student has sleep insomnia or not, which would affect their sleeping habits making it more difficult for them to fall asleep.


- Another lurking variable could be the amount of homework or things a student has to do that day that require them to stay up later and prevent them from going to sleep as soon as they should.

Subject Blind? Evaluator Blind? Double Blind?

The subjects are somewhat blind because they know to a certain extent how they will sleep. They know that if they stay up all night they will not get a lot of sleep, but they will not know whether they will be waking up in the middle of the night after they have fallen asleep.


This study is evaluator blind because the evaluators will not know how the child is going to sleep until after the results have been taken up.


This study is not fully subject blind, so it can not be double blind, because in order to be double blind it would need to be subject and evaluator blind.

What type of study is this & did it have the 3 characteristics of a well designed study?

This study is an observational study because the observers are observing what the results of getting more or less sleep will be.


This study was a well designed study because it had all three characteristics.

It was randomized, had a sufficient number of subjects, and had a controlled variable.

“A random sample of 19,299 children aged 5.08 to 11.99 years old, 49.7% boys and 50.3% girls with a mean age of 9.00 years old, participated in a cross-sectional survey which was conducted in 8 cities of China.”

Study Two-Sleep and Student Achievement (US)

Lurking Variables

There are a couple lurking variables for this study.


One of them was the situations that prevent students from sleeping such as chores, homework, pleasure reading, etc.


The second one was the normal academic performance for each student.

Subject blind? Evaluator blind? Double blind?

This study was subject blind because the students wont know how the amount of sleep they get will affect their achievements.


This study was also evaluator blind because they evaluator wont know how the amount of sleep the subjects got will affect their achievements until they see the results.


Since the study is both subject blind and evaluator blind it is considered double blind.

What type of study is this & did it have the 3 characteristics of a well designed study?

This study was an observational study because the evaluators are observing how the effects of sleep affect a student's achievements.


This study did not have the three characteristics of a well designed one.


- This study was not randomized because the school where the students went to were chosen specifically.

- The study did have a sufficient number of subjects with 1,724 students in this study.

- This study also had a controlled group.

Our Study-The Effects of Sleep on Academic Performance

Lurking Variables

This study had four lurking variables:

- What is preventing students from obtaining sleep

- If students have test anxiety

- If the students typically prepare for tests/quizzes

- How the students usually perform on tests and quizzes

Subject blind? Evaluator blind? Double blind?

This study was not double blind because it was not subject nor evaluator blind.


The students knew how much sleep they receive a night and how much they study, so it was not subject blind.


The evaluator needs to know the lurking variables and conditions of the students before and during the test

What type of study is this?

This study was an survey study because it had students take a survey on:

- What grade do they typically receive in their academic classes?

- If they typically prepare for tests/quizzes?

- How old they are?

- If they believe they preform better on a test/quiz of they receive the optimal amount of sleep?

- How much sleep they usually receive a night?

- If they have test anxiety?

- And what are some of the things that prevents them from getting sleep?

3 characteristics of a well designed study?

No, this study does not have the the three characteristics of a well designed study.


- There is not random selection because the school of CCTL was chosen and the students chose whether or not they filled out the survey

- There is a sufficient amount of subjects, 133 participants.

- There is a compare group, those who study before test/quizzes, receive optimal amount of sleep, and do not have test anxiety.