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# Engineering Measurements Lecture 6: Errors and Precision

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### What are the three types of errors that occur in measurements?

Systematic, Random, and Parasitic errors

### What is the purpose of estimating uncertainty in measurements?

To interpret the uncertainty, which requires the width of the margin and confidence level (C.L.)

### What are the two requirements to interpret uncertainty in measurements?

Width of margin and Confidence Level (C.L.)

### What is the purpose of Type A estimation of uncertainty?

<p>To use statistical methods with repeated measurements</p> Signup and view all the answers

### What are the key characteristics of a Normal Distribution?

<p>𝒙𝒎𝒆𝒂𝒏 , 𝒙𝒎𝒆𝒅𝒊𝒂𝒏 , Standard Deviation, and Variance</p> Signup and view all the answers

### What is the difference between random errors and systematic errors in measurements?

<p>Random errors are unpredictable and vary in magnitude and direction, while systematic errors are consistent and have a constant magnitude and direction.</p> Signup and view all the answers

### What is meant by uncertainty in measurements?

<p>Uncertainty in measurements refers to the range of values within which the true value of a measurement is likely to lie.</p> Signup and view all the answers

### What is the purpose of estimating uncertainty in measurements?

<p>The purpose of estimating uncertainty is to quantify the range of values within which the true value of a measurement is likely to lie, providing a confidence interval for the measurement.</p> Signup and view all the answers

### How is the Standard Normal Table used in estimating uncertainty?

<p>The Standard Normal Table is used to find the probability of a given range of values in a normal distribution, which is used to estimate the uncertainty of a measurement.</p> Signup and view all the answers

### What is error propagation, and how is it estimated?

<p>Error propagation is the process of combining the uncertainties of individual measurements to estimate the uncertainty of a derived quantity, and it is estimated using the rules of error propagation such as the sum and product rules.</p> Signup and view all the answers

### How is the number of transistors with a current gain between 19.8 and 20.2 calculated using the Standard Normal Table?

<p>The number of transistors with a current gain between 19.8 and 20.2 is calculated by finding the z-scores for 19.8 and 20.2, and then using the Standard Normal Table to find the probability of the range, and finally multiplying the probability by the total number of transistors.</p> Signup and view all the answers

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