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Sonbull [250]
3 years ago
8

The local school board needs to choose whether to build an addition to the elementary school library or remodel the

Mathematics
1 answer:
11Alexandr11 [23.1K]3 years ago
7 0

Answer:

A random sample of 10% of all taxplayers

Step-by-step explanation:

Smaller sample sizes may not be representive of the population

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A 95% confidence interval for a population mean is computed from a sample of size 400. Another 95% confidence interval will be c
Anna [14]

Answer:

The interval from the sample of size 400 will be approximately <u>One -half as wide</u> as the interval from the sample of size 100

Step-by-step explanation:

From the question we are told the confidence level is  95% , hence the level of significance is    

      \alpha = (100 - 95 ) \%

=>   \alpha = 0.05

Generally from the normal distribution table the critical value  of  \frac{\alpha }{2} is  

   Z_{\frac{\alpha }{2} } =  1.96

Generally the 95% confidence interval is dependent on the value of the margin of error at a constant sample mean or sample proportion

Generally the margin of error is mathematically represented as

      E = Z_{\frac{\alpha }{2} } * \frac{\sigma}{\sqrt{n} }    

Here assume that Z_{\frac{\alpha }{2} } \ and \  \sigma \ is constant so

     E =  \frac{k}{\sqrt{n} }

=>  E \sqrt{n} = K

=>   E_1 \sqrt{n}_1 =  E_2 \sqrt{n}_2

So  let  n_1 = 400 and n_2 =  100

=>   E_1 \sqrt{400} =  E_2 \sqrt{100}

=>  E_1 =  \frac{\sqrt{100} }{\sqrt{400} } E_2

=>  E_1 =  \frac{1}{2 } E_2

So From this we see that  the confidence interval for a sample size of 400 will be half that with a sample size of 100

   

     

   

7 0
2 years ago
PLEASE HELP ME WITH THIS I DONT PAY ATTENTION LOL BUT HELPPP
vfiekz [6]

Answer:

down ⬇⬇⬇

Step-by-step explanation:

5. its all of them so just write A, B, C, D, E, F, G

6. (equilateral) triangle, right triangle, diamond (?), parallelogram

7. C and E; A and B

8. not so sure about this one but i think its regular

9. its not a polygon because polygons have straight sides, and this figure does not.

10. the only polygon is C

pay attention in school, it'll help in the long run. even if it sounds boring, it will come in handy one day!!

hope this helped <33333

4 0
2 years ago
John can clean pools at a constant rate of 3/5 pools/hours. How many pools can John clean in 10 hours?
Ket [755]

Answer:

30/5=  6

Explicción:

Lo  utliplicas yl odivides ..m

7 0
2 years ago
Help will give max points and branlisest plls HELP ASAP BY 1230pt thanks ;]
Murljashka [212]

Answer:

120cm^3

Step-by-step explanation:

4 0
2 years ago
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Which phrase describes the algebraic expression x/15?
ss7ja [257]
The quotient of a number and 15
8 0
2 years ago
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