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butalik [34]
3 years ago
13

Help with algebra 2 test please and thank you

Mathematics
1 answer:
loris [4]3 years ago
3 0

Answer:

w=63

Step-by-step explanation:

1. Multiply both sides by 2

2. square both sides

At this point, you should have this:

w+1=64

Subtract 1 from both sides.

w=63

HTH, good luck :)

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Answer:

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104

STEP-BY-STEP EXPLANATION:

Given:

Standard deviation (σ) = 700

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We have for a confidence level of 95%:

\begin{gathered} \alpha=100\%-95\%=5\%=0.05 \\  \\ \alpha\text{/2}=\frac{0.05}{2}=0.025 \\  \\ \text{ The corresponding Z value for \alpha/2 = 0.025 is as follows:} \\  \\ Z_{\alpha\text{/2}}=1.96 \end{gathered}

Now, we calculate the minimum value of the sample size as follows:

\begin{gathered} n=\left(\frac{Z_{\alpha\text{/2}}\cdot\sigma}{E}\right)^2 \\  \\ \text{ We replacing:} \\  \\ \:n=\left(\frac{1.96\cdot 700}{135}\right)^2 \\  \\ \:n=103.2858\cong104 \end{gathered}

The minimum sample size needed is 104

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