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Kitty [74]
3 years ago
6

The average rainfall in Phoenix is 8.29 inches per year. The table shows recent data on the difference in annual rainfall from t

he average. Phoenix Annual Total Rainfall Year Rainfall compared to average yearly rainfall 2008 +6.57 inches 2009 –2.68 inches 2010 +12.26 inches 2011 –4.38 inches 2012 –4.46 inches Which list represents the years from driest to wettest?
Mathematics
2 answers:
Harrizon [31]3 years ago
8 0

Answer:

c

Step-by-step explanation:

Aleonysh [2.5K]3 years ago
5 0

Answer:

C-2012, 2011, 2009, 2008, 2010

Step-by-step explanation:

Took the test

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Determine the sample size needed to construct a 90% confidence interval to estimate the population proportion when p = 0.65 and
WINSTONCH [101]

Answer:

n=170

Step-by-step explanation:

1) Notation and definitions

n random sample taken (variable of interest)

\hat p=0.65 estimated proportion.

p true population

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 90% of confidence, our significance level would be given by \alpha=1-0.90=0.1 and \alpha/2 =0.05. And the critical value would be given by:

z_{\alpha/2}=\pm 1.64

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.06 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)  

And replacing into equation (b) the values from part a we got:

n=\frac{0.65(1-0.65)}{(\frac{0.06}{1.64})^2}=169.968  

And rounded up we have that n=170

6 0
3 years ago
The hawk population in a county is declining at a rate of 1.4% per year. the population was 3800 in the year 2016. which answer
Anika [276]

After a year the population will be 98.6% (100% - 1.4%) 98.6% as a decimal is 0.986 ... so after 1 year it will be: <span>

3800 x 0.986 

after 2 years it will be: 

3800 x 0.986 x 0.986... 

after 3 years: 3800 x (0.986)^3 

<span>in 2018. And after 4 years it will be 3800 x (0.986)^4 = which is 3591.62724 or 3592</span></span>

6 0
3 years ago
What is the value of x?<br><br><br><br> Enter your answer in the box.<br><br> x =
polet [3.4K]
The two angles are the same value. To find, think of the equation 3<em>x</em>+50=6<em>x</em>-10. Put the 6<em>x</em> to the other side of the equation. You shall get -3x+50=-10. Move the 50 to the other side, and you'll end up with -3<em>x</em>=-60. Divide each number by -3 to find <em>x</em> now. Your final answer will be <em>x=20</em>.

Answer: <em>x=20</em>
8 0
3 years ago
The length of a spring varies directly with the mass of an object that is attached to it. When a 30-gram object is attached, the
Rom4ik [11]
M/s=30/9 =10/3

so, 3m=10s
8 0
3 years ago
Read 2 more answers
7/10 divided by -2/7
Tpy6a [65]

Answer:

1/20

Step-by-step explanation:

hope this helps

6 0
2 years ago
Read 2 more answers
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