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Engineering Statistics Homework 1

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Submitted By lucychou369
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1.7 Review Problems

4. (a) measured during the experiment- measurand
(b) Fixed throughout the experiment- parameter
(c) Not controlled during the experiment- extraneous
(d) Affected by a change made by the experimenter- dependent
(e) Changed by the experimenter- independent

5. What is the main purpose of the scientific method?
The scientific method is used mainly to validate a particular hypothesis or to determine the range of validity of a hypothesis.

6. Classify the following experiments:
(a) estimation of the heating value of gasoline- explorational
(b) measuring the stress-strain relation of a new bio-material- variational
(c) the creation of Dolly- exploratoinal

7. An experiment is performed to determine the velocity profile along a wind tunnel’s test section using a pitot-static tube. The tunnel flow rate is fixed during the experiment. Identify the independent, dependent, extraneous, and parameter variables from the following list:
(a) independent
(b) independent
(c) extraneous
(d) parameter
(e) dependent
(f) dependent 1.8 Homework Problems

6. Select one of the 10 most beautiful physics experiments. Briefly explain the experiment and classify its type. Then list the variable involved in the experiment. Finally, classify each of these variables Galileo’s experiment of falling objects

Drop two balls of different weights from a leaning tower and see which one will land first. The result is that two balls landed at the same time.

Classify: Validational experiment.

Variables: (a) two balls’ weights: independent
(b) tower’s height: parameter
(c) gravity: parameter
(d) the velocity of wind: extraneous
(e) the time two balls land: dependent
(f) height to drop the balls: dependent

7. Measure the volume of room and find the number of molecules in it? Is this an experiment? If so, classify it. The room size: 4m*5m*3.5m
Volume: 70m^3
Number of molecules: 1.75*10^27 It’s not an experiment. An experiment is an act in which one physically intervenes with the process under investigation and records the results. It does not involve any physical change in the process. It is only a measurement.

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