A biologist wants to compare the proportions of rainbow trout infected with whirling disease (an illness of
trout and salmon caused by a microscopic parasite) coming from two separate watersheds. For each
watershed, the biologist will collect a random sample of trout and record the proportion infected in the
sample. The biologist intends to estimate the difference for all trout in the two watersheds. Assuming all
conditions for inference are met, which of the following is the most appropriate method for the biologist to
use to analyze the results?
A
A one-sample z-interval for a population proportion
B
A one-sample z-interval for a sample proportion
с
A one-sample z-interval for a difference in sample proportions
D
A two-sample z-interval for a difference in population proportions
E
A two-sample z-interval for a difference in sample proportions

Answer:

[tex]x = -20[/tex]

Step-by-step explanation:

Use inverse operations and simplification to isolate the variable in the equation.

[tex]-\frac{2}{5}x + 7 = 15\\-7\\\\-\frac{2}{5}x = 8\\[/tex]

Now divide the equation by [tex](-\frac{2}{5})[/tex] remember, dividing a fraction is the same as multiplying by the reciprocal. The reciprocal of a fraction is when one switches the places of the numerator (number on top of a fraction bar), and the denominator (number on the bottom of the fraction bar).

[tex]-\frac{2}{5}x = 8\\[/tex]

÷[tex]-\frac{2}{5}[/tex]

[tex]x = 8 * (-\frac{5}{2})[/tex]

Simplify,

[tex]x = 4 *(- 5)\\\\ x= -20[/tex]

Answer:

30mph faster

Step-by-step explanation:

first you must find how fast the train can go in 1 hour

that is 60mph, then multiply 60 and 2.5

60x2.5 = 150mph then,

150 - 120 =30mph

very sorry if this is wrong

The average speed of the train is 1.25 times the average speed of the car.

Speed is defined as the length traveled by a particle or entity in an hour. It is a scale parameter. It is the ratio of length to duration.

We know that the speed formula

Speed = Distance/Time

The excursion from Manhattan to Montauk Point is 120 miles via train or via vehicle. A train makes the outing in 2 hours, while a vehicle makes the excursion in 2.5 hours.

The average speed of the train is given as,

⇒ 120 / 2

⇒ 60 miles per hour

The average speed of the car is given as,

⇒ 120 / 2.5

⇒ 48 miles per hour

The ratio of the average speed of the train to the car will be given as,

⇒ 60/48

⇒ 1.25

The average speed of the train is 1.25 times the average speed of the car.

More about the speed link is given below.

https://brainly.com/question/7359669

#SPJ5

Answer:

B

Step-by-step explanation:

Closest answer

Answer:

1

Step-by-step explanation:

hope it helps . ans is c

Answer:

look up

Step-by-step explanation:

Answer:

D-16

Step-by-step explanation:

Answer:

D. 16

Step-by-step explanation:

On one shelf, she can put 4 baskets.

So, on 4 shelves, she can put (4 x 4) 16 baskets.

Hope this helps :)

Answer:

6 and 4

Step-by-step explanation:

6+4 = 10

6-2 = 4

Answer:

7.25

Step-by-step explanation:

is your answer number 4

Answer:

46 pounds

Step-by-step explanation:

Answer:

21 pounds

Step-by-step explanation:

28) y + 2y + 1 + y + 2y + 1

29) y^2 + 4y + 2

30) The two expressions are equal because its the same question written in two different forms, one of the expression is written in an unsmplified form and the other expression is the simplified form.

= y + y = y^2

= 2y + 2y = 4y

= 1 + 1 = 2

= y^2 + 4y + 2

I haven't done this in a long time so I'm sorry if it's wrong

Answer:

0.02272727272

You can search for any mathematical expression, using functions such as: sin, cos, sqrt, etc. You can find a complete list of functions here.

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)

%

AC

7

8

9

÷

4

5

6

×

1

2

3

−

0

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=

+

Rad

Deg

x!

Inv

sin

ln

π

cos

log

e

tan

√

Ans

EXP

xy

=

123

Fx

Answer:

4/11 is the answer plz mark as brainlliest

Answer:

Constant speed

Step-by-step explanation:

That's the answer

Answer:

C.

Step-by-step explanation:

Answer:  24 ???

Step-by-step explanation:

4 mins to run 5 ... so im guessing it goes by 5

5 = 4

10 = 8

15 = 12

20 = 16

25 = 20

30 = 24

I am not sure if its right but that what i think ( you can use a table btw one colom that says laps and starts with 5 then the other colom that says mins and starts with 4

Hope its right Good Luck have a good rest of your day

Answer:

4*5*7=140 ways

Step-by-step explanation:

First he has to decide on a pair of pants and he has 4 different choices.

For each of those choices he has a choice of 7 different shirts, so that gives him 4 times 7 = 28 different pant/shirt combinations. (I hope none of the pants are striped and none of the shirts have polka-dots).

For each those 28 possibilities, he has 5 different ties he could select, so altogether he has 28 times 5 = 140 different outfits, and some of them may be acceptable to wear in public.

It is simply , 4*5*7=140 ways.

Answer:

x = 7

Step-by-step explanation:

A right angle is equal to 90 degrees

The sum of the angles, 55 and 5x, should equal 90

55 + 5x = 90

Isolate the variable

Subtract both sides by 55

55 - 55 + 5x = 90 - 55

5x = 35

Divide both sides by 5

5x ÷ 5 = 35 ÷ 5

x = 7

Answer:

option A

Step-by-step explanation:

144 = 4 * 4 * 3 * 3 = 2 * 2 * 2 *2 * 3 * 3 = 2⁴* 3²

a¹² = a⁽³ˣ⁴⁾ = (a³)⁴

[tex]\sqrt[4]{144a^{12}b^{3}} =\sqrt[4]{2^{4}*3^{2}*(a^{3})^{4}*b^{3}}\\\\=2*a^{3}\sqrt[4]{3*3*b^{3}}\\\\=2a^{3}\sqrt[4]{9b^{3}}[/tex]

Answer:

-0.4285714286

Step-by-step explanation:

-3/7 = -0.4285714286

Answer:

b. The mean of the sampling distribution will be equal to 0.2028.

f. The sampling distribution will be approximately normal.

g. The standard deviation of the sampling distribution will be 0.0336.

Step-by-step explanation:

We use the Central Limit Theorem to solve this question.

Central Limit Theorem:

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean [tex]\mu = p[/tex] and standard deviation [tex]s = \sqrt{\frac{p(1-p)}{n}}[/tex].

The sample proportion being approximately normal means that option f. is correct.

Of 143 men, 29 said they would.

This means that [tex]p = \frac{29}{143} = 0.2028[/tex]

This means that option b is correct.

g. The standard deviation of the sampling distribution will be 0.0336.

Lets find the standard deviation.

Sample of 143, so [tex]n = 143[/tex]

[tex]s = \sqrt{\frac{0.2028*0.7972}{143}} = 0.0336[/tex]

So option g. is correct.

The statements that accurately describe the sampling distribution of the sample proportion of men would return money from a found wallet are;

B) The mean of the sampling distribution will be equal to 0.2028.

F) The sampling distribution will be approximately normal.

G) The standard deviation of the sampling distribution will be 0.0336.

We are given the true proportion of all adult men who will return the money as; p = 18% = 0.18

Thus, the population mean = 0.18

Now, out of 143 men, 29 said they will return the money. Thus;

Sample mean = Sample proportion = 29/143 =  0.2028

The formula for the sampling standard deviation is;

s = √[p^(1 - p^)/n]

s = √[0.2028(1 - 0.2028)/143]

s = √0.001130574545

s = 0.0336

Looking at the options and comparing to the answers gotten above, only option B, F and G are correct.

Read more about Central Limit Theorem at; https://brainly.com/question/25800303

Answer:

[tex]\displaystyle \frac{x + 2}{x + 9}, \ x \neq -9, \ 12[/tex]

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Algebra I

Algebra II

Step-by-step explanation:

Step 1: Define

[tex]\displaystyle \frac{x^2 - 10x - 24}{x^2 - 3x - 108}[/tex]

Step 2: Simplify

We know that x cannot equal -9 because we would get a divide by 0 (undefined) error. We also know that x cannot equal 12 because it was canceled out when simplifying.

Answer:

what is this language

Step-by-step explanation:

Answer:

hope it will help you.....

Answer:

30.5x1200=36600

r=el avion vuela a 36.600m de altura

Answer: 9/12 ÷ 3/12 is 3.

Step-by-step explanation: Do the KFC.

K. Keep.

F. Flip the second term to 12/3.

C. Change the ÷ into ×. Then, solve.

9 x 12 is 108, and 3 x 12 is 36.

108 ÷ 36 = 3.

Answer:

h=52

Step-by-step explanation: You subtract 36 from both sides and it cancels on the right but on the left you do regular subtraction and you get that h equals 52

Answer:

h = 52

Step-by-step explanation:

h + 36 = 88

subtract 36 from both sides

h = 52

Answer:

4 now hurry

Step-by-step explanation:

Step-by-step explanation:

volume of water flows through the pipe per second= π r² h = 22/7 × ( 3/4)² × 16

= 22/7 × 9/16 × 16

= 22/7 × 9

= 3.14 × 9 = 28.26 cm ³= 28.26/ 1000= 0.02826 litre

0.02826litre = 1 second

1 litre = 1 / 0.02826 = 100000/2826

= 35 .38 seconds

answer = 35.38 seconds

plz mark my answer as brainlist plzzzz.

hope this will be helpful to you ☺️.

Answer:

A

Step-by-step explanation:

You should know the area of a circle, A = πr².

So, all you need to find is the area of half a circle, or A = [tex]\frac{1}{2}[/tex] πr²

We see that the radius is half of the diameter or r = 6 in.

A = [tex]\frac{1}{2}[/tex] (3.14)(6)²

A = 56.52 in²