Personal Investigation 1

Question 1

Define sleep

Answer 1

A periodic, natural, reversible and near total loss of consciousness

Question 2

What is the experimental hypothesis?

Answer 2

There will be an increase in sleep quality out of 21 on the PSQI for teens(13-18 years old) compared to adults(19years+)

Question 3

What is the dependent variable?

Answer 3

Pittsburgh sleep quality index score out of 21

Question 4

Give four examples of confounding variables and how to control for them

Answer 4

• Sleep disorders
• Stress levels
• Caffiene levels
• Medical isssues
  Ask P’s about CVs and eliminate any P’s with them

Question 5

Give three examples of extraneous variables and how to control for them

Answer 5

• Time of the year
• Temperature
• Time of the day
  Ask P’s to complete the PSQI at the same time

Question 6

What is the experimental design and why?

Answer 6

Independent measures as participants can’t be both an adult and teen

Question 7

What was the samppling method used and what are the strenght/limitations?

Answer 7

Opportunity sampling
* Strengths=Large sample collected/Quicker than random/don’t have to obtain a full list of target population
* Limitations=Not always representative of target population/Participants share similar characteristics

Question 8

What is the descriptive statistic used and graphical representation?

Answer 8

Mean and a bar graph because we have nominal level data

Question 9

What is the inferential statistic used?

Answer 9

Mann whitney U

Question 10

What conclusions can be drawn from your findings?

Answer 10

In conclusion, there are no significant differences between teens and adulys on the PSQI measure of sleep quality