A Quality Control Manager at a Plant That Produces O-Rings

question 303

Multiple Choice

A quality control manager at a plant that produces o-rings is concerned about whether the diameter of the o-rings that are produced is conformable to the specification. She has calculated
That the average diameter of the o-rings is 4.2 centimeters. She also knows that approximately
95% of the o-rings have diameters fall between 3.2 and 5.2 centimeters and almost all of the o-
Rings have diameters between 2.7 and 5.7 centimeters. When modeling the diameters of the o-
Rings, which distribution should the scientists use?

• A) Uniform distribution
• B) Binomial distribution
• C) Normal distribution
• D) Exponential distribution

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Definitions:

Null Hypothesis

The premise in statistical testing that proposes there is no effect or no difference, serving as the basis for assessing observational data.

Heavy Pollution

Refers to a high level of contamination in the environment, often caused by industrial, agricultural, or urban activities, that can harm human health and ecosystems.

Wilcoxon Signed Rank Test

A non-parametric statistical test used to compare two related samples, matching pairs, or repeated measurements on a single sample to assess whether the population mean ranks differ.

Null Hypothesis

A default hypothesis that there is no effect or no difference, and it's the assumption to be tested in statistical analysis.