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RideAnS [48]
3 years ago
11

A rectangular sandbox has an area of 3x square inches. If the width of the sandbox is x inches, what is the length of the sandbo

x?​
Mathematics
1 answer:
steposvetlana [31]3 years ago
3 0
Area = length • width
3x = L • x
L = 3
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Past experience has indicated that the breaking strength of yarn used in manufacturing drapery material is normally distributed
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Answer:

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Step-by-step explanation:

Our sample size is 11.

The first step to solve this problem is finding our degrees of freedom, that is, the sample size subtracted by 1. So

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Then, we need to subtract one by the confidence level \alpha and divide by 2. So:

\frac{1-0.95}{2} = \frac{0.05}{2} = 0.025

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Now, we find the standard deviation of the sample. This is the division of the standard deviation by the square root of the sample size. So

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Now, we multiply T and s

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For the upper end of the interval, we add the sample mean and M. So the upper end of the interval here is

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So

95% two-sided confidence interval on the true mean breaking strength is (94.8cm, 99.2cm).

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