Experimental vs
observational
Independent/Dependent
observational
Independent/Dependent
One group of subjects was given an herbal supplement and another group was given a placebo. After one year, the number of illnesses each group had was compared.
Experiment
The author of the statistical study was an observer at a police sobriety checkpoint at which every 5th driver was stopped and interviewed. Which sampling type is this?
Systematic
A researcher for the Spaulding athletic equipment company is studying the relationship between the level of education and participation in any sport. She conducts a survey of 40 randomly selected golfers, 40 randomly selected tennis players and 40 randomly selected swimmers. Which sampling type is this?
Stratified Random
Hours in the mall vs. amount of money spent
Positive Correlation
People’s tendency to behave differently when they are being studied
Hawthorne effect
A researcher stood at a school parking lot entrance to see if the color of a car is related to the driver not wearing a seatbelt.
Observational
A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the five closest to her desk.
Self selected
In a Gallup poll of 1059 adults, the interview subjects were selected by using a computer to randomly generate telephone numbers that were then called. Which sampling type is this?
Temperature and number of people wearing jackets
Negative correlation
These are variables that can potentially distort the relationship between the IV and the DV.
Confounding Variables
When researchers tested the phizer vaccine, they wanted to know how many people would get covid after being vaccinated, as compared to a control group. This was a double blind experiment. What was the independent variable?
The vaccine or the placebo
"Ha" There will be a significant difference between the vaccinated group and the placebo group in terms of how many of them got covid.
Alternative Hypothesis
When researchers tested the phizer vaccine, they wanted to know how many people would get covid after being vaccinated, as compared to a control group. This was a double blind experiment. What was the control group?
The placebo group
the INDEPENDENT variable be in an experiment testing which types of paper airplane goes furthest?
The type of paper airplaine
This hypothesis describes the initial belief that there has been no change in ABILITY or that there is no difference in the outcome given two different contexts
Null Hypothesis
When researchers tested the phizer vaccine, they wanted to know how many people would get covid after being vaccinated, as compared to a control group. What type of research study is this?
Experimental
An engineering student measures the strength of fingers used to push buttons by testing family members. Which sampling type is this?
Convenience
On Days of presidential elections, the news media organize an exit poll in which specific polling stations are randomly selected and all voters are surveyed as they leave the premises. Which sampling type is this?
Cluster
When researchers tested the phizer vaccine, they wanted to know how many people would get covid after being vaccinated, as compared to a control group. This was a double blind experiment. What was the treatment group?
The group that got the vaccine
Both the doctors and the patients didn't know it was an experiment
Double blind
When experimenting with the growth of a plant, a scientist uses three (of the same type of) plants, two different fertilizers, equal light, and equal water. What type of variable is the fertilizer?
Independent Variable
A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the first five who raise their hands.
Self Selected
An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the dependent variable is ...
The growth of the plant
"Ho" There will be no difference between the vaccinated group and the placebo group in terms of how many of them got covid.
Null Hypothesis