Giving brainliest *easy*

686.924 rounded to the nearest ten

AysviL [449]

Ten: 690

Tenth: 686.9

3 0

4 years ago

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We would like to create a confidence interval.

Vlada [557]

Answer:

c.A 90% confidence level and a sample size of 300 subjects.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level $1-\alpha$ , we have the confidence interval with a margin of error of:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

In this problem

The proportions are the same for all the options, so we are going to write our margins of error as functions of $\sqrt{\pi(1-\pi)}$

So

a.A 99% confidence level and a sample size of 50 subjects.

$n = 50$

99% confidence interval

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

The margin of error is

$M = z\sqrt{\frac{\pi(1-\pi)}{n}} = \frac{2.575}{\sqrt{50}}\sqrt{\pi(1-\pi)} = 0.3642\sqrt{\pi(1-\pi)}$

b.A 90% confidence level and a sample size of 50 subjects.

$n = 50$

90% confidence interval

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The margin of error is

$M = z\sqrt{\frac{\pi(1-\pi)}{n}} = \frac{1.645}{\sqrt{50}}\sqrt{\pi(1-\pi)} = 0.2623\sqrt{\pi(1-\pi)}$

c.A 90% confidence level and a sample size of 300 subjects.

$n = 300$

90% confidence interval

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The margin of error is

$M = z\sqrt{\frac{\pi(1-\pi)}{n}} = \frac{1.645}{\sqrt{300}}\sqrt{\pi(1-\pi)} = 0.0950\sqrt{\pi(1-\pi)}$

This produces smallest margin of error.

d.A 99% confidence level and a sample size of 300 subjects.

$n = 300$

99% confidence interval

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

The margin of error is

$M = z\sqrt{\frac{\pi(1-\pi)}{n}} = \frac{2.575}{\sqrt{300}}\sqrt{\pi(1-\pi)} = 0.1487\sqrt{\pi(1-\pi)}$

6 0

4 years ago

24 POINTS!!!!!!!!!!!!

harina [27]

The answer is A F. hope i helped

8 0

4 years ago

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Help me out pleasessssssssssss

Over [174]

I will mark brainlist please help

Story : A Dog’s Tale by Mark Twain

1. Using a dog as narrator gives the passage a tone of —

• objectivity
• formality
• bitterness
• humor

2. What literary device is used in the sentence “She had one word which she always kept on hand, and ready, like a life-preserver”?

• Simile
• Metaphor
• Hyperbole
• Onomatopoeia

3. Based on the second paragraph, the word mastiff most likely means —

• a large dog
• a male dog
• a man’s shirt
• a part of a ship

4. According to the author, what would bring such happiness to the dogs as he describes at the end of the story?

• They helped the author’s mother find the words she used, so they especially enjoyed watching her use them.

• They knew the meaning of “supererogation” and realized they were listening to a funny joke.

• Watching and laughing as others were embarrassed vindicated their own previous embarrassment.

• They were generally happy dogs who often expressed a great deal of joy.

5. “A Dog’s Tale” uses the topic of animal communication in order to —
• show how dogs really communicate

• explain how animals learn from humans

• demonstrate that dogs are smarter than most people

• poke fun at human behavior

6. The amount of time that passes during this story is most likely —

• 10 hours

• 10 days

• 10 months

• 10 years

7. An underlying theme in this story is that —

•many people use words without knowing their meanings

• dogs know more than people realize

• family loyalty takes top priority

• strangers are almost always suspicious

8. Since the author used first person, readers are left to wonder —

• how the author felt about his mother

• how strangers reacted to his mother’s word knowledge

• what the author’s mother was thinking

• whether or not the author’s mother knew the meanings of all the words she used

5 0

3 years ago

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How many 4 minutes and 30 seconds in 2 hours

AleksAgata [21]

4 minutes and 30 seconds go into 2 hours 26 times

119

7 0

4 years ago

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