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tia_tia [17]
3 years ago
13

A study of the effects of acid rain on trees in the Hopkins Forest shows that 25 of 100 trees sampled exhibited some sort of dam

age from acid rain. This rate seemed to be higher than the 15% quoted in a recentEnvironmetricsarticle on the average proportion of damaged trees in the Northeast. Does the sample suggest that trees in the Hopkins Forest are more susceptible than trees from the rest of the region
Mathematics
1 answer:
Grace [21]3 years ago
5 0

Answer:

Yes

Step-by-step explanation:

We can test this claim using the one proportion z test :

x = 25 ; n = 100

Phat = x / n = 25 / 100 = 0.25

H0 : P = 0.15

H0 : P > 0.15

The test statistic :

Z = (phat - p) ÷ √p(1-p)/n

Z = (0.25-0.15) ÷ √(0.15*0.85)/100

Z = 2.8

Using the Pvalue from Zscore calculator :

α = 0.05

Pvalue (Z < 2.8) =0.0026

Pvalue < α ; We reject the Null

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Identify the fractions as proper, improper, or mixed; however, if the fraction is equivalent to one, indicate so. 3 1/8
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3 years ago
If a line crosses the y-axis at (0, 1) and has a slope of 45, what is the equation of the line?
tamaranim1 [39]
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y = mx + b 

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The answer should be option D.
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3 years ago
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Complete the statement using or =. <br><br><br> B) 16/11 ____ 1.45….
alexgriva [62]

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greater than sign (>)

Step-by-step explanation:

1.45 can be rewritten as a fraction (1 and 1/20). 16/11 can be rewritten as 1 and 5/11. The greater the denominator, the smaller the number. So, with the previous sentence in mind, 16/11 (1 and 5/11) is greater than 1.45 (1 and 1/20).

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3 years ago
What is the missing dimension of a rectangle or prism with the following dimensions and volume? Length 3 cm width 5 cm volume 45
olasank [31]
Hello! 

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Because we only know the length and the width, we can multiply those to get started. 3 x 5 is 15, so we know that's what we can start with.

Because we know the volume, all we have to do is do h x 15 = volume (45). Now, what is height?

In order to find the height, we must find a number that, when multiplied by 15, equals 45. 

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That means 3 is your height.

Hope I helped! :)
3 0
3 years ago
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