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Method A: Randomly divide a group of 100 people with minor cuts into two groups. Have each group use a different ointment and record how long it takes their cuts to heal. Method B: Choose 100 people at random. Ask which ointments they have used in the past and how quickly their cuts have healed with each ointment. Method C: Monitor 100 people who are currently treating minor cuts with an ointment of their choosing and record how long it takes for them to heal. Tell whether each method of gathering data is a survey, an observational study, or an experiment. Which option would give the most reliable results?

Method A: Randomly divide a group of 100 people with minor cuts into two groups. Have each group use a different ointment and record how long it takes their cuts to heal. Method B: Choose 100 people at random. Ask which ointments they have used in the past and how quickly their cuts have healed with each ointment. Method C: Monitor 100 people who are currently treating minor cuts with an ointment of their choosing and record how long it takes for them to heal. Tell whether each method of gathering data is a survey, an observational study, or an experiment. Which option would give the most reliable results?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 7CR
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A researcher is considering three methods of evaluating two different brands of first aid healing ointment for minor cuts. Classify each method as a survey, an experiment, or an observational study. Then explain which method would be the most reliable. Method A: Randomly divide a group of 100 people with minor cuts into two groups. Have each group use a different ointment and record how long it takes their cuts to heal. Method B: Choose 100 people at random. Ask which ointments they have used in the past and how quickly their cuts have healed with each ointment. Method C: Monitor 100 people who are currently treating minor cuts with an ointment of their choosing and record how long it takes for them to heal. Tell whether each method of gathering data is a survey, an observational study, or an
Transcribed Image Text:A researcher is considering three methods of evaluating two different brands of first aid healing ointment for minor cuts. Classify each method as a survey, an experiment, or an observational study. Then explain which method would be the most reliable. Method A: Randomly divide a group of 100 people with minor cuts into two groups. Have each group use a different ointment and record how long it takes their cuts to heal. Method B: Choose 100 people at random. Ask which ointments they have used in the past and how quickly their cuts have healed with each ointment. Method C: Monitor 100 people who are currently treating minor cuts with an ointment of their choosing and record how long it takes for them to heal. Tell whether each method of gathering data is a survey, an observational study, or an
Method A: Randomly divide a group of 100 people with minor cuts into two groups. Have each group use a different ointment and record how long it takes their cuts to heal. Method B: Choose 100 people at random. Ask which ointments they have used in the past and how quickly their cuts have healed with each ointment. Method C: Monitor 100 people who are currently treating minor cuts with an ointment of their choosing and record how long it takes for them to heal. Tell whether each method of gathering data is a survey, an observational study, or an experiment. Which option would give the most reliable results?
Transcribed Image Text:Method A: Randomly divide a group of 100 people with minor cuts into two groups. Have each group use a different ointment and record how long it takes their cuts to heal. Method B: Choose 100 people at random. Ask which ointments they have used in the past and how quickly their cuts have healed with each ointment. Method C: Monitor 100 people who are currently treating minor cuts with an ointment of their choosing and record how long it takes for them to heal. Tell whether each method of gathering data is a survey, an observational study, or an experiment. Which option would give the most reliable results?
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