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Mademuasel [1]
3 years ago
12

What is the value of -d When d= -2 A 4 B -4 C -2 D 2

Mathematics
1 answer:
Aloiza [94]3 years ago
3 0
-4 cause a negative plus a negative is a negative
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Step-by-step explanation:

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A study sampled 350 upperclassmen (Group 1) and 250 underclassmen (Group 2) at high schools around the city of Portland. The stu
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Answer:

-0.061 < P_1 -P_2< 0.025

Step-by-step explanation:

Give data:

n_1 = 350

n_2 =250

x_1 = 23

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for 95% confidence interval

\alpha = 1 - 0.95 = 0.05 and \alpha/2 = 0.025

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confidence interval for P_1  and P_2 is

\hat{P} 1 - \hat{P} 2 \pm z_{\alpja/2} \sqrt{\frac{\hat{P} 1(1-\hat{P} 1)}{n_1} +\frac{\hat{P} 2(1-\hat{P} 2)}{n_2}}

(0.066 - 0.084) \pm 1.96 \sqrt{\frac{0.066(1-0.066)}{350} +\frac{0.084(1-0.084)}{250}}

-0.018 \pm 0.043

confidence interval is

-0.018 - 0.043 < P_1 -P_2

-0.061 < P_1 -P_2< 0.025

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Step-by-step explanation:

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Is this a trick question? They're both a pound. 
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