Week in Review – Stat 201
Session 2 – Monday September 13th, 2021
Dr. Hernandez-Magallanes
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1. Explain what the difference between descriptive statistics and inferential statistics.
The difference between the two methods is that descriptive statistics is limited to only the data
being summarized, whereas inferential statistics applies to a larger population than those
observed
2. Explain the difference between a survey and a census.
A survey is based on results from a (representative) sample, or subset, of the population, while
a census is based on results from the entire population.
3. What is the name of a study that the purpose is to determine whether a treatment causes
a change in the variable of study (i.e. clinical trial)?
a. Observational Study
b. Randomized Experiment
c. Census
d. Sample Survey
e. More than one of the above
4. Lauren wants to determine what the average house price is for single family homes in Los
Angeles, California. She randomly selects 50 single family homes in Los Angeles and looks
up the most recent value for each of these 50 homes. What is the sample in this study?
a. All residents of Los Angeles, California
b. All single-family homeowners in Los Angeles, California
c. All single-family homes in Los Angeles, California
d. The 50 selected homes in Los Angeles, California
e. The homeowners of the 50 selected homes in Los Angeles, California
5. Which of the following is an example of a self-selected sample?
a. Researcher splits their population into a group of a males and a separate group of females;
she takes a random sample of 25 males and a separate random sample of 25 females
b. Radio asks people listening to call in and say whether or not they want a new stoplight at a
busy intersection
c. Student asks 15 classmates to answer a survey about university fees
d. Researcher at a major university randomly selects 50 students to participate in a survey. She
sends the survey to the 50 selected students via email and 45 of them return the survey. – this
error is called no-response
e. More than one of the above
