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Phantasy [73]
3 years ago
12

Find the exact length of the third side​

Mathematics
1 answer:
Kamila [148]3 years ago
7 0

A^{2} +B^{2} =C^{2}

2^{2} +B^{2} =8^{2}

B^{2} =64-4

B=\sqrt{60}

B=7.7459666924

≈7.75

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Answer:

(1) Correct option is B.

(2) Correct option is C.

Step-by-step explanation:

The information provided is:

n_{1}=200,\ \bar x_{1}=22.7,\ s_{1} = 4.5\\n_{2}=200,\ \bar x_{2}=19.7,\ s_{2} = 4.3

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CI=\bar x_{1}-\bar x_{2}\pm t_{\alpha/2, (n_{1}+n_[2}-2}\sqrt{\frac{s_{1}^{2}}{n_{1}}+\frac{s_{2}^{2}}{n_{2}} }

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degrees of freedom =n_{1}+n_{2}-2=200+200-2=398

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CI=22.7-19.7\pm 1.96\sqrt{\frac{4.5^{2}}{200}+\frac{4.3^{2}}{200} }\\=3\pm0.8624\\=(2.1376, 3.8624)\\\approx(2.14, 3.86)

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Correct option is B.

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As the value 0 is not in the interval this implies that there is a difference between the two means, concluding that priming does have an effect on scores.

Correct option is C.

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