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VLD [36.1K]
3 years ago
11

"Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. Complete parts​ (a) through​

(c) below. TInterval ​(13.046,22.15) x= 17.598 Sx = 16.01712719 n= 50 a. Express the confidence interval in the format that uses the​ ""less than"" symbol. Given that the original listed data use one decimal​ place, round the confidence interval limits accordingly."b. Identify the best point estimate of μ and the margin of error.
c. In constructing the confidence interval estimate of μ​, why is it not necessary to confirm that the sample data appear to be from a population with a normal​distribution?
A. Because the sample standard deviation is​ known, the normal distribution can be used to construct the confidence interval.
B. Because the sample is a random​ sample, it can be assumed that the sample mean is from a population with a normal distribution.
C.Because the population standard deviation is​ known, the normal distribution can be used to construct the confidence interval.
D. Because the sample size of 50 is greater than​ 30, it can be assumed that the sample mean is from a population with a normal distribution.
Mathematics
1 answer:
Stella [2.4K]3 years ago
6 0

Answer:

it is not necessary to confirm that the sample data appear to be from a population with a normal ​distribution;

D. Because the sample size of 50 is greater than​ 30, it can be assumed that the sample mean is from a population with a normal distribution

Step-by-step explanation:

Normal distribution which is  otherwise known as the Gaussian distribution, it is a probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean.

The arithmetic mean or average; is the sum of a collection of numbers divided by the total  numbers in the collection.

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Newborn Brain Damage Researchers studied 208 infants whose brains were temporarily deprived of oxygen due to complications at bi
Kazeer [188]

Answer:

To provide a baseline for judging the survival rates of infants who received whole-body cooling

Step-by-step explanation:

In this case, the purpose of the experiment is to see whether reducing body temperature for three days after birth increased the rate of survival without brain damage.

Then, the proposed method (whole-body cooling) has to be contrasted with the baseline, in this case, the "usual care". If we want to know if this proposed method is statistically better, we have to compare with these baseline with random sampling out of the same population.

If it is not compared to nothing or to a new method, it wouldn't be possible to conclude if the method is better or not than the usual care.

6 0
2 years ago
There is a markup of 40% on the original price of a fan. If the fan was sold for $42, what was its original price
Akimi4 [234]

Answer:   21$ that is the answer

Step-by-step explanation:

4 0
2 years ago
A survey of 1,000 men and women asked, "Do you earn over $50,000 per year?" The table below shows the responses for males and fe
frutty [35]
                                               Male    Female    Total
Income over $50,000         485        385         870
Income below $50,000        65           65        130
<span>Total                                       550        450       1,000

Probability of being male: 550/1000 = 0.55
Probability of earning over $50,000: 870/1000 = 0.87

0.55 x 0.87 = 0.4785

Probability of being male and earning over $50,000: 485/550 = 0.8818

</span><span>C) No, P(being male | the person earns over $50,000) ≠ P(being male)</span><span>


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7 0
3 years ago
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When the door was left open, 36 pigeons flew the coop. If this was 40 percent of all the pigeons, how many pigeons were there or
Zielflug [23.3K]

Answer:

100%

Step-by-step explanation:

6 0
3 years ago
At the theater, tickets for adults cost $4.75
shutvik [7]
X+y= 26 and 4.75x + 2.25y= 83.50

y=26-x( substitute this into second equation for y and solve for x)

4.75x + 2.25(26-x)= 83.50

4.75x + 58.5-2.25x= 83.50

x= 10

Now solve for y by substituting your answer for x

10+ y= 26

y=16

Therefore, 16 tickets were purchased for kids and 10 for adults.

7 0
2 years ago
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