3 years ago

What's the answer to the question I really need help

Mathematics

1 answer:

olga nikolaevna [1]3 years ago

5 0

The volume is 25.12
i hope i helped

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The school paper charges $1.50 for an ad, plus 25 cents per word. Carl wants to spend only $12.00 on the ad.

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How much is 19.5% of 600?

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A survey reported that 70% of those responding to a national survey of college freshmen were interested in taking summer courses

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Answer:

95% confidence interval: (0.5717,0.8283)

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 49

p = 70% = 0.7

Alpha, α = 0.05

The confidence interval can be calculated as:

$p \pm z_{critical}\sqrt{\dfrac{p(1-p)}{n}}$

Putting the values, we get,

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

$0.7 \pm 1.96(\sqrt{\dfrac{0.7(1-0.7)}{49}} ) = 0.7 \pm 0.1283 =(0.5717,0.8283)$

95% confidence interval: (0.5717,0.8283)

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