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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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<u>6</u>

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3 years ago
The daltons completed 30% of their 2140-mile trip the first day
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To figure out how many miles the Daltons traveled the first day you times 2140 miles and 30 percent.
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4 0
3 years ago
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Isabelle has a bag of apples that contains green and red apples. She gives 1 green apple and 2 red apples to each of her 5 frien
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d)15 apples

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If Luis makes orange soda by mixing 4 liters of orange juice with 5 liters of soda water, what amount of orange juice should he
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