3 years ago

Need help with math problem don’t understand

Mathematics

1 answer:

MariettaO [177]3 years ago

5 0

Answer:

should be D

Step-by-step explanation:

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Answer:

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3 years ago

How would you solve this, need help

spayn [35]

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Jake paid $28.00 for admission to the county fair and bought 12 tickets to play games. If he spent a total of $64, what is the c

Karolina [17]

Answer:

64 - 28 = 36

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3 years ago

How do I solve 3x + 3 = 9?

Arte-miy333 [17]

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A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 425 babies were born, a

kupik [55]

Answer:

0.75<p<0.85

Yes,the proportion of girls is significantly different from 0.5.

Step-by-step explanation:

We calculate the proportion of girls:

$p=\frac{340}{425}\\\\\\\\=0.8$

#We then calculate the confidence interval as follows:

$CI=p\pm z(ME)\\\\=p\pm z_{0.005}\sqrt{\frac{p(1-p)}{n}}\\\\=0.8+2.576\times \sqrt{\frac{0.8\times 0.2}{425}}\\\\=0.8\pm0.05\\\\=[0.75,0.85]$

Hence, the proportion's confidence interval at 99% is 0.75<p<0.85

#We then state our hypothesis to validate the claim:

$H_o:p=0.5\\H_a:p>0.5\\\\p=0.8(True \ mean)$

Since the confidence interval does not contain 0.5, which is the the 50% chance of having a girl, then it can be concluded the proportion of girls is significantly different from 0.5.

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4 years ago