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balu736 [363]
3 years ago
14

Sarah has a make your own candle set that includes a block of wax in the shape of a rectangular prism. The block of wax has a le

ngth of 8 inches, a width of 6 inches, and a height 3 inches. She wants to make 4 cylindrical candles called pillar candles. Each candle mold will have a diameter of three inches and a height of 6 inches. Does she have enough wax to make the pillar candles? If not, how many complete candles can she make

Mathematics
1 answer:
rosijanka [135]3 years ago
8 0

Answer:

She doesn't have enough wax to make 4 candles, but she does have enough to make 3 whole candles

Step-by-step explanation:

Please refer to the attached image for explanations

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An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an est
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Answer:

The 80% confidence interval for the mean number of words a third grader can read per minute is between 40.4 wpm and 40.8 wpm.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.8}{2} = 0.1

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

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M = 1.28*\frac{4.1}{\sqrt{840}} = 0.2

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The upper end of the interval is the sample mean added to M. So it is 40.6 + 0.2 = 40.8 words per minute.

The 80% confidence interval for the mean number of words a third grader can read per minute is between 40.4 wpm and 40.8 wpm.

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