Observational Studies and Experiment

To find out what the preferred ice cream flavor is, wait outside an ice cream parlor and ask every 4th person leaving the store to name his or her favorite flavor until you get 25 responses is an example of...

• Convenience Sample
• Simple Random Sample
• Stratified Random Sample
• Systematic Sample

To study the amount of time students spend doing homework each day, use a random number generator to select 25 students from the student enrollment database to survey.

• Convenience Sample
• Simple Random Sample
• Stratified Random Sample
• Interval Sample

An experiment is ________ when both the researcher and the subjects of the experiment do not know who received the treatment.

• blind
• double blind
• biased
• an observational study

A numerical characteristic of the POPULATION

• Statistic
• Parameter
• Observation
• Study

A Parks Department employee wants to know if latex paint is more durable than non-latex paint. She has 50 park benches painted with latex paint and has 50 park benches painted with non-latex paint.

• Experiment

• Survey

• Observational study

To test the redesign of it’s website, an online bookseller assembled 96 users of the site and randomly divided them into two groups. One group used the new website to make a purchase and one group used the old website to make the same purchase. Users of the new site were able to complete the purchase 22% faster

• Experiment

• Survey

• Observational study

A researcher asks college students how many hours of sleep they got on an average night and examines whether the number of hours of sleep affects the students’ grades

• Experiment

• Survey

• Observational study

A grocery store conducts an online study in which customers are randomly selected and asked to provide feedback on their shopping experience

• Expirement

• Survey

• Observational study

In a survey of a sample of computer users, 8% said their computer had a malfunction that needed to be repaired by a service technician.

• parameter
• statistic

What kind of data is the following?
Eye color in a selected group of students

• Qualitative
• Quantitative 
• Both
• Neither