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4 years ago

12

On a map the key indicates that one inch equals 50 miles. It is 600 miles from Ricky's house to the Willis tower in Chicago. Wha

t is the distance from Ricky's house to the Willis tower on the map

1 answer:

Sloan [31]4 years ago

6 0

600/50=12
so the answer will be 12 inches

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You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the

Vesna [10]

Answer:

A sample size of at least 1,353,733 is required.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.

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

In which

z is the zscore that has a pvalue of .

The margin of error is:

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

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a pvalue of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.327$ .

You would like to be 98% confident that you esimate is within 0.1% of the true population proportion. How large of a sample size is required?

We need a sample size of at least n.

n is found when M = 0.001.

Since we don't have an estimate for the proportion, we use the worst case scenario, that is $\pi = 0.5$

So

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

$0.001 = 2.327\sqrt{\frac{0.5*0.5}{n}}$

$0.001\sqrt{n} = 2.327*0.5$

$\sqrt{n} = \frac{2.327*0.5}{0.001}$

$(\sqrt{n})^{2} = (\frac{2.327*0.5}{0.001})^{2}$

$n = 1353732.25$

Rounding up

A sample size of at least 1,353,733 is required.

5 0

4 years ago

P+1/p=7 then p^3+1/p^3

arlik [135]

This is your perfect answer

4 0

3 years ago

The Pythagorean theorem is a2+b2=c2. Solve for b.

nata0808 [166]

Answer:

b = √c²-a²

Step-by-step explanation:

b² = c² - a²

b = √c²-a²

3 0

3 years ago

Sonia is standing between two buildings. The building to her left is 112 feet tall and the building to her right is 78 feet tall

djverab [1.8K]

I give up on this one because it is so hard

4 0

3 years ago

"what are the largest values of n for which n! has fewer than 100 decimal digits

ikadub [295]

I can only thin of a hot and miss method to do this . That is using Stirlings approximation for n!-

ln n! = approx n ln n - n

so if we try n = 60 this gives 4.2796 * 10^80

so we could try higher values:-

n = 65 gives an 89 digit number

n = 70 gives 98 digit number

n=71 gives me an memory error on my calculator!

Lets try an online calculator

Web2.0 calculator gives a 101 digit number or n=71

70 is your answer

4 0

3 years ago