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rewona [7]
3 years ago
7

The water level of a creek has risen 4 inches above its

Mathematics
2 answers:
trapecia [35]3 years ago
6 0

Answer:

4 hours

Step-by-step explanation:

MrRa [10]3 years ago
4 0
I will take 4 hours for it to be be 12 inches above its flood stage
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8 0
3 years ago
There are 2,920 seats in an auditorium. the audition has 20 sections with the same number of seats in each section. how many sea
OverLord2011 [107]
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3 0
3 years ago
Suppose that a market research firm is hired to estimate the percent of adults living in a large city who have cell phones. 500
Alborosie

Answer:

The 95% confidence interval estimate for the true proportion of adults residents of this city who have cell phones is (0.81, 0.874).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

n = 500, \pi = \frac{421}{500} = 0.842

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.842 - 1.96\sqrt{\frac{0.842*0.158}{500}} = 0.81

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.842 + 1.96\sqrt{\frac{0.842*0.158}{500}} = 0.874

The 95% confidence interval estimate for the true proportion of adults residents of this city who have cell phones is (0.81, 0.874).

6 0
3 years ago
13 POINTS IF YOU ANSWER!!!
Whitepunk [10]
H: 5 square yards is the correct answer, break the figure into squares and then multiply length by width to get area
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2 years ago
mrs. Hudson invested $700 into an account that draws 3% interest, compounded annually. what is the total value of the account af
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700 x .03 x 20 = 420
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1120 is in the account after 20 years
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3 years ago
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