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lara [203]
3 years ago
15

Please help!! I'm confused

Mathematics
1 answer:
seraphim [82]3 years ago
7 0
It’s like 40 I do believe but ion rlly no like that fr
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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
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Answer:  a) (176.76,172.24), b) 0.976.

Step-by-step explanation:

Since we have given that

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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
Help me out please:)
stich3 [128]

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the answer is

(8.5,13.5)

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