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2 years ago

PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!! Which equation matches the graph?

Mathematics

1 answer:

tatyana61 [14]2 years ago

3 0

Answer: D) -2 |x| - 2

<u>Step-by-step explanation:</u>

A v-shaped graph is an absolute value graph.

The general form of an absolute value equation is: y = a |x - h| + k

where (h, k) represents the vertex and "a" represents the vertical stretch (aka slope).

The vertex of the given graph is (0, 2), however the graph is inverted (upside-down) which is a reflection across the x-axis. Therefore,

a = -2
(h, k) = (0, -2)

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2 years ago

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The true average strain in a way that conveys information about precision and reliability is 27.314.

Given that sample size is 20, mean is 26%, standard deviation is 3.4, confidence level is 95%.

We have to calculate the true average strain in a way that conveys information about precision and reliability.

We have to use t test in our problem because sample size is less than 30.

Weknow that,

t=x bar-μ/s $\sqrt{n}$

where μ is sample mean,

s is sample standard deviation.

Degree of freedom=n-1

=20-1

=19

T value at 95% confidence interval=1.7281

put the values in the formula of t given above.

1.7291=x bar-26/3.4/ $\sqrt{20}$

1.7291=xbar-26/3.4/4.47

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x bar=26+1.314

x bar=27.314

After rounding it will be 27.31

Hence the true average strain in a way that conveys information about precision and reliability is 27.31%.

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