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katrin2010 [14]
3 years ago
9

Which of the following statements are not true in developing a confidence interval for the population mean?

Mathematics
1 answer:
frutty [35]3 years ago
8 0

Answer:

b) The width of the confidence interval becomes narrower when the sample mean increases.

Step-by-step explanation:

The confidence interval can be calculated as:

\bar{x} \pm \text{Test Statistic}\displaystyle\frac{\sigma}{\sqrt{n}}

a) The width of the confidence interval becomes wider as the confidence level increases.

The above statement is true as the confidence level increases the width increases as the absolute value of test statistic increases.

b) The width of the confidence interval becomes narrower when the sample mean increases.

The above statement is false. As the sample mean increases the width of the confidence interval increases.

c) The width of the confidence interval becomes narrower when the sample size n increases.

The above statement is true as the sample size increases the standard error decreases and the confidence interval become narrower.

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Readme [11.4K]

Answer:

first you take the square root or 0.9, 2.7, 1.7, and 0.4 which will equal=

0.9= ~0.94

2.7=~1.64

1.7=~1.30

0.4=~0.63

0.94 - 1.64 + 1.30 + 0.63 = 1.23

hope this helps! C:


8 0
3 years ago
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Natali5045456 [20]

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2 years ago
in a large population, 65 % of the people have been vaccinated. if 4 people are randomly selected, what is the probability that
attashe74 [19]

The probability that at least one of them has been vaccinated is equal to 98.5% if 65% of the people have been vaccinated.

Considering P to be the probability that at least one is vaccinated and q to be the probability that none of the four are vaccinated; the sum of all the probabilities must equal 1; therefore,

P = 1 - q

As 65% of the population is vaccinated, therefore 35% are not vaccinated. Thus any person has a probability of 0.35 of not being vaccinated;

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P = 0.985

Converting it into percentage;

P = 0.985 × 100 = 98.5%

Therefore the probability that at least one of them has been vaccinated is calculated to be 98.5%

To learn more about probability; click here:

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1 year ago
A. Yesterday, Kelly went to the Sea Animal Park on a class trip. The Sea Animal Park had a total of 3,840 visitors for the first
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Answer:

1195

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Susan is paving a rectangular patio with at most 308 bricks. If there are 22 bricks along the length of the patio, how many bric
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An inequality to find this would be
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