3 years ago

Please help, really don’t know

Mathematics

1 answer:

Rama09 [41]3 years ago

5 0

Answer:

2 hours and 45 minutes

Step-by-step explanation:

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An article gave the following summary information for fracture strengths (MPa) of n = 196 ceramic bars fired in a particular kil

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Answer:

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Step-by-step explanation:

Sample mean fracture strength (x) = 55.36 MPa

Sample standard deviation (s) = 3.99 MPa

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The upper and lower bounds for a 95% confidence interval are given by:

$U=x+1.960*\frac{s}{\sqrt{n}} \\L=x-1.960*\frac{s}{\sqrt{n}}$

The upper and lower bounds of the confidence interval are;

$U=55.36+1.960*\frac{3.99}{\sqrt{196}}\\U= 55.92\\L=55.36-1.960*\frac{3.99}{\sqrt{196}}\\L= 54.80\\$

The 95% confidence interval for true average fracture strength is 54.80 MPa to 55.92 MPa

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