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Get Full Access to Statistics For Engineers And Scientists - 4 Edition - Chapter 6.1 - Problem 6e
Get Full Access to Statistics For Engineers And Scientists - 4 Edition - Chapter 6.1 - Problem 6e

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# A certain type of stainless steel powder is supposed to

ISBN: 9780073401331 38

## Solution for problem 6E Chapter 6.1

Statistics for Engineers and Scientists | 4th Edition

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Problem 6E

A certain type of stainless steel powder is supposed to have a mean particle diameter of µ = 15 µm. A random sample of 87 particles had a mean diameter of 15.2 µm, with a standard deviation of 1.8 µm. A test is made of H0: µ = 15 versus H1: µ ≠ 15.

a. Find the P-value.

b. Do you believe it is plausible that the mean diameter is 15 µm?, or are you convinced that it differs from 15 µm? Explain your reasoning.

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Section 3.1 STAT 250 David Holmes FEB 13 Numerical Summaries of Center and Variation Three characteristics of a numerical variable’s distribution: • Shape • Center (Typical Value) • Spread (Variability) Can a few numerical measures be used to describe a distribution’s entire shape NO Graphs provide the best overall picture of a distribution. Always plot your data. Measures of Center • Numeric values that represent the average or typical value of a numerical variable. • Arithmetic mean of a variable. (unimodal, symmetric) • Median of a variable. (unimodal, skewed and/or has outliers) • Mode of a variable. (categorical) • We can use the relationship among t

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