2 years ago

Select the correct answer.

Mathematics

1 answer:

malfutka [58]2 years ago

5 0

It is definitely a reflection over the horizontal (x) axis, but i think the dilation is by 2

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Harlamova29_29 [7]

Step-by-step explanation:

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2 years ago

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dezoksy [38]

Answer: The margin of error = 3.71, confidence interval = (354.04, 361.46) and it means that mean cost is lies within the confidence interval.

Step-by-step explanation:

Since we have given that

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Standard deviation = $37.89

At 95% confidence level, z = 1.96

We first find the margin of error.

Margin of error is given by

$z\times \dfrac{\sigma}{\sqrt{n}}\\\\=1.96\times \dfrac{37.89}{\sqrt{400}}\\\\=3.71$

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$\bar{x}\pm \text{margin of error}\\\\=357.75\pm 3.71\\\\=(357.75-3.71,357.75+3.71)\\\\=(354.04,361.46)$

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3 years ago