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3 years ago

Can someone please check my answer !!!

Mathematics

2 answers:

Verdich [7]3 years ago

7 0

Answer:

its actually the one on the top right

Step-by-step explanation:

Hope it helps ;)

let me know

Bess [88]3 years ago

7 0

Ur right I think I’m 89% sure ahh

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3 years ago

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3 years ago

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3 years ago

A study sampled 350 upperclassmen (Group 1) and 250 underclassmen (Group 2) at high schools around the city of Houston. The stud

iris [78.8K]

Answer:

$-0.048$

Do not reject $H_0:P_1-P_2=0$

Step-by-step explanation:

From the question we are told that

Sample size $n_1=350$

Sample size $n_2=250$

Sample proportion 1 $\hat P= \frac{25}{350} =>0.07$

Sample proportion 2 $\hat P= \frac{19}{250} =>0.076$

95% confidence interval

Generally for 95% confidence level

Level of significance

$\alpha = 1-0.95=>0.05$

$\alpha /2=\frac{0.05}{2} =>0.025$

Therefore

$Z_a_/_2=1.96$

Generally the equation for confidence interval between $P_1 - P_2$ is mathematically given as

$(\hat P_1-\hat P_2)\pm Z_a_/_2\sqrt{\frac{\hat P_1(1-\hat P_1)}{n_1}+\frac{\hat P_2(1-\hat P_2)}{n_2} }$

$(0.07-0.076)\pm 1.96\sqrt{\frac{0.07(1-0.07)}{350}+\frac{0.076(1-0.076)}{250} }$

$(0.07-0.076)\pm 1.96\sqrt{4.66896*10^-^4 }$

$(-0.006)\pm 0.042$

$(-0.006)- 0.042=>-0.048$

$(-0.006)+ 0.042=>0.036$

Therefore

Confidence interval is

$-0.048$

Conclusion

Given the confidence interval has zero

Therefore do not reject $H_0:P_1-P_2=0$

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2 years ago

In 2012, the population of a city was 6.29 million. The exponential growth rate was

RoseWind [281]

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Answer:

a) P(t) = 6.29e^(0.0241t)

b) P(6) ≈ 7.3 million

c) 10 years

d) 28.8 years

Step-by-step explanation:

a) You have written the equation.

P(t) = 6.29·e^(0.0241·t)

b) 2018 is 6 years after 2012.

P(6) = 6.29·e^(0.0241·6) ≈ 7.2686 ≈ 7.3 . . . million

c) We want t for ...

8 = 6.29·e^(0.0241t)

ln(8/6.29) = 0.0241t

t = ln(8/6.29)/0.0241 ≈ 9.978 ≈ 10.0 . . . years

d) Along the same lines as the calculation in part (c), doubling time is ...

t = ln(2)/0.0241 ≈ 28.7613 ≈ 28.8 . . . years

4 0

3 years ago