Direction: Explain each study described in each scenario. (Sample Surveys Study, Experiment Study or Observational Study). Please answer only (Sample Surveys Study, Experiment Study or Observational Study) and please explain why. Thank you so much and God bless!

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Direction: Explain each study described in each scenario. (Sample Surveys Study, Experiment Study or Observational Study).

Please answer only (Sample Surveys Study, Experiment Study or Observational Study) and please explain why. Thank you so much and God bless!

3. A textile engineer is interested in measuring heat resistance for four different types of
threads used in making fire-resistant clothing for firefighters. A random sample of 20
threads from each type was taken and subjected to hear test to determine resistance ( the
length of time the fibers survive before starting to burn).Explain what type of study this is
and why.
Transcribed Image Text:3. A textile engineer is interested in measuring heat resistance for four different types of threads used in making fire-resistant clothing for firefighters. A random sample of 20 threads from each type was taken and subjected to hear test to determine resistance ( the length of time the fibers survive before starting to burn).Explain what type of study this is and why.
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