Statistics Unit Review

• Sample Survey
• Census
• Observational Study
• Simulation

• a control group
• a placebo 
• blinding
• none of these

In a statistical study this is the entire group of individuals we want information about.

• Population

• Sample

• Planet

• Nation

The smaller group of individuals we use to represent the population.

• Sample

• Census

• Survey

• Individuals

Choosing a sample in such a way that each individual is equally likely to be chosen. Think drawing names from a hat.

• SRS

• Systematic Sample

• Cluster Sample

• Stratified Sample

When two variables are associated in a way that their effects on the response variable cannot be distinguished from each other. Think education and initial wealth both affect wealth later in life.

• Confounding variable

• Response variable

• Nonresponse variable

I want to know something about HHS students, so I randomly choose 100 students from the school to give a survey to. Who is the population?

• All HHS students

• All high school students

• 100 HHS students

• All freshman students a HHS

A doctor takes a random sample of 100 people who entered a hospital and measured their heights. The average height was 67 inches. If the doctor took a different random sample of 100 people on a different day, what would you expect to be true about the average measurement taken?

• The average would be close to 67 inches, but not necessarily the same.

• The average would be much lower than 67 inches.

• The average would be much higher than 67 inches.

• The average would be exactly 67 inches.

A doctor takes a random sample of 20 people who entered a hospital and measured their heights. The average height was 67 inches. If the doctor took a different random sample of 20 people on a different day, what would you expect to be true about the average measurement taken?

• The average would be close to 67 inches, but not necessarily the same.

• The average could be very different because the sample is small.

• The average could be very different because the sample is large.

• The average would be exactly 67 inches.

This is when we decide to break our population into different groups, typically based on certain demographics, before choosing random samples from each group.

• Cluster

• Stratified

• SRS

• Systematic