4 Levels of Measurement
A list of music genres
Nominal
A group of 20 people are randomly assigned a number and then are randomly selected using a random number table
Simple Random Sample
23 of Mr. Ruff's 40 statistics students are surveyed on if they enjoy school lunch
Sample
Different types of cookies
qualitative
Observational study or Experiment?
Mr. Ruff is observing a football game and recording how many times the running back carries the ball.
Observational Study
What level of measurement would the "amount of goals a soccer player scores in one year" fall under?
Ratio
Mr. Ruff uses his statistics class as a sample since they are right there.
Convenience Sample
Some of the people in a football stadium are surveyed on if they enjoy the fan experience
Sample
The number of people in a class
quantitative
A statistician is wanting to see if a new plant grows more in the sun or in the shade. She puts half of her plants in the sun, and half of her plants in the shade. She then records her results in 3 weeks
Experiment
What level of measurement would the top 100 songs of the decade fall under?
Ordinal
A group of 100 people are assigned a number. The researcher starts at the number 3 and then chooses every 5th number for their sample.
Systematic Sample
All of the sophomores in the school district are asked if they participate in sports
Population
The amount of people that voted in the last election
Quantitative
Mr. Ruff wants to test whether ibuprofen reduces swelling in some of his athlete's knees. He gives some of his athletes the actual ibuprofen and some of his athletes a placebo. The athletes who received the placebo reacted favorably to the ibuprofen. What is this phenomenon called?
The Placebo Effect
What level of measurement would credit scores fall under (the credit score scale is 300-850).
Interval
HSHMC is split into it's 4 grade levels and then some students from each grade level are selected for the sample
Stratified
Every person in the united states is surveyed on whether they approve of the current president
population
A list of the people who have worn the number 3 on the San Diego Padres in the last 50 years
Qualitiative
What is the difference between the interval level of measurement and the ratio level of measurement.
Zero is not inherent at the interval level. Zero is inherent at the ratio level.
San Diego County is split into 25 zip codes and then all people from three different zip codes are selected for the sample
Cluster
A study is being done on if residents of California enjoy living in California. All of the San Diego residents are being surveyed first.
All residents of CA are the population
All residents of San Diego are a sample
Players' numbers on a football team.
Qualitative
Mr. Ruff wants to test whether ibuprofen reduces swelling in some of his athlete's knees. He gives some of his athletes the actual ibuprofen and some of his athletes a placebo. The athletes who received the placebo reacted favorably to the ibuprofen. What technique could be used to prevent this?
Blinding