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2 years ago

The city library is having a book sale to make room for the new books it purchased. The graph shows the cost, y, in dollars, to

Mathematics

2 answers:

Agata [3.3K]2 years ago

7 0

Answer:

Step-by-step explanation:

Zolol [24]2 years ago

4 0

Answer:

The

cost of the books

depends on the

(number of books purchased)

At the sale, each book costs $

(0.50)

Step-by-step explanation:

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alina1380 [7]

Answer:

Step-by-step explanation:

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3 years ago

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Serga [27]

Answer:

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Step-by-step explanation:

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3 years ago

In a Gallup poll, 1025 randomly selected adults were surveyed and 29% of them said that they used the Internet for shopping at l

svetoff [14.1K]

Answer: (0.25,0.33)

Step-by-step explanation:

A 99% confidence interval for population proportion is given by:-

$\hat{p}\pm 2.576\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$ , where $\hat{p}$ = sample proportion, $n$ = sample size.

Given: $n=1025, \hat{p}=0.29$

A 99% confidence interval estimate of the proportion of adults who use the Internet for shopping:

$0.29\pm 2.576\sqrt{\dfrac{0.29(1-0.29)}{1025}}\\\\=0.29\pm 2.576\sqrt{0.00020087804878}\\\\=0.29\pm2.576(0.01417)\\\\=0.29\pm0.03650192\\\\=(0.29-0.03650192,\ 0.29+0.03650192)\\\\=(0.25349808,\ 0.32650192)$

$\approx(0.25,\ 0.33)$

Thus, a 99% confidence interval estimate of the proportion of adults who use the Internet for shopping = (0.25,0.33)

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3 years ago