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2 years ago

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The new releases make up of the available DVDs at a DVD store. The equation below is used to determine the total number of DVDs

(d) in the store.
What is the total number of DVDs in the store?

1 answer:

lilavasa [31]2 years ago

5 0

I’m so sorry I forgot about you texting me lol I just got home and I’m not getting tired

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stealth61 [152]

We can factor <span>4x^2-25 into (2x +5) * (2x -5) and
dividing by (2x -5)
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That neatened up pretty nicely.</span>

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A university's freshman class has 10000 students. 2500 of those students are majoring in Engineering. What percentage of the fre

Musya8 [376]

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3 years ago

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When 258 college students are randomly selected and surveyed, it is found that 106 own a car. Find a 99% confidence interval for

juin [17]

Answer: 0.332 < p < 0.490

Step-by-step explanation:

We know that the confidence interval for population proportion is given by :-

$\hat{p}\pm z^*\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

, where n= sample size

$\hat{p}$ = sample proportion

z* = critical z-value.

As per given , we have

n= 258

Sample proportion of college students who own a car = $\hat{p}=\dfrac{106}{258}\approx0.411$

Critical z-value for 99% confidence interval is 2.576. (By z-table)

Therefore , the 99% confidence interval for the true proportion(p) of all college students who own a car will be : $0.411\pm (2.576)\sqrt{\dfrac{0.411(1-0.411)}{258}}\\\\=0.411\pm (2.576)\sqrt{0.00093829}\\\\= 0.411\pm (2.576)(0.0306315197142)\\\\=0.411\pm 0.0789=(0.411-0.0789,\ 0.411+0.0789)\\\\=(0.3321,\ 0.4899)\approx(0.332,\ 0.490)$

Hence, a 99% confidence interval for the true proportion of all college students who own a car : 0.332 < p < 0.490

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2 years ago