3 years ago

3. Consider the equations 8 + x = n.

Mathematics

1 answer:

Scrat [10]3 years ago

3 0

If n is a negative number, x would be less than -8.

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Suppose a researcher is estimating the proportion of trees showing signs of disease in a local forest. They randomly sample 150

Serhud [2]

Answer:

$0.167 - 1.96 \sqrt{\frac{0.167(1-0.167)}{150}}=0.107$

$0.167 + 1.96 \sqrt{\frac{0.167(1-0.167)}{150}}=0.227$

And the 95% confidence interval would be given (0.107;0.227).

Step-by-step explanation:

Information given

$X= 25$ number of trees with signs of disease

$n= 150$ the sample selected

$\hat p=\frac{25}{150}= 0.167$ the proportion of trees with signs of disease

The confidence interval for the true proportion would be given by this formula

$\hat p \pm z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}$

For the 95% confidence interval the significance is $\alpha=1-0.95=0.05$ and $\alpha/2=0.025$ , and the critical value would be

$z_{\alpha/2}=1.96$

And replacing we got:

$0.167 - 1.96 \sqrt{\frac{0.167(1-0.167)}{150}}=0.107$

$0.167 + 1.96 \sqrt{\frac{0.167(1-0.167)}{150}}=0.227$

And the 95% confidence interval would be given (0.107;0.227).

6 0

3 years ago

The compiled enrolled in the three grades at Willmar middle is 977. There are 356 students in the seventh grade and 365 in the e

Julli [10]

977- (356+365) = x

356+365= 721

977- 721 = 256

x= 256

256 students in the sixth grade

4 0

3 years ago

The difference of twenty-one and eight times a number n is thiry-five

nalin [4]

Answer:

n=7

Step-by-step explanation:

difference means subtraction so:

8n - 21= 35

8n=35+21

8n= 56

n= 56÷8

n=7

8 0

2 years ago

What is 245 the the power of 8?

vlabodo [156]

Answer:

1.2981614e+19

Step-by-step explanation:

you can always use a calculator for powers.

7 0

3 years ago

Marissa got an 85 on her math quiz she got 34 questions correct how many questions are on the quiz

galina1969 [7]

85/100=34/?
85÷2.5=34
100÷2.5=40
34/40=34/? ?=40
there were 40 questions

4 0

3 years ago