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3 years ago

Choose the correct equation

Mathematics

2 answers:

Vsevolod [243]3 years ago

6 0

Answer:

Step-by-step explanation:

lions [1.4K]3 years ago

4 0

Answer:

A: 160+12m=400

Step-by-step explanation:

i am very smart just trust me on this one

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3 years ago

Can someone explain what to do here I’m very confused?

Grace [21]

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3 years ago

How do I find the perimeter of this ?

gavmur [86]

Answer:

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Step-by-step explanation:

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3 years ago

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andre [41]

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3 years ago

9.4 The heights of a random sample of 50 college stu- dents showed a mean of 174.5 centimeters and a stan- dard deviation of 6.9

gladu [14]

Answer: a) (176.76,172.24), b) 0.976.

Step-by-step explanation:

Since we have given that

Mean height = 174.5 cm

Standard deviation = 6.9 cm

n = 50

we need to find the 98% confidence interval.

So, z = 2.326

(a) Construct a 98% confidence interval for the mean height of all college students.

$x\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=(174.5\pm 2.326\times \dfrac{6.9}{\sqrt{50}})\\\\=(174.5+2.26,174.5-2.26)\\\\=(176.76,172.24)$

(b) What can we assert with 98% confidence about the possible size of our error if we estimate the mean height of all college students to be 174.5 centime- ters?

Error would be

$\dfrac{\sigma}{\sqrt{n}}\\\\=\dfrac{6.9}{\sqrt{50}}\\\\=0.976$

Hence, a) (176.76,172.24), b) 0.976.

8 0

3 years ago