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3 years ago

State the name of the sampling method used in each of the following scenarios.

Mathematics

1 answer:

Evgesh-ka [11]3 years ago

3 0

Answer:

1. convenience sampling method

2. simple random sampling method

3. cluster sampling method

4. stratified sampling method

Step-by-step explanation:

1. convenience sampling method:

what this biologist does is to take a sample from the lake in a non random fashion. It is a non probability sampling method. And it doesn't involve selecting participants randomly.

2. simple random sampling

the question says that the respondents who are US residents are randomly selected. Each of the resident has equal probability of being chosen

3. cluster sampling method:

this researcher groups the full population into 200 farms and then he picks 4 clusters randomly then he surveyed all cows in the 4 selected farms

4. stratified sampling method:

The researcher shares the full voter population into several counties which are regarded as stratas. From where a simple random sampling of 50 registered voters from each of the counties are selected.

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Please solve the question and give correct answer with explanation so that i can understand it

denis-greek [22]

Answer:

Step-by-step explanation:

Let the speed of the car is c and speed of the plane is p.

<h3>We are given:</h3>

The speed of the plane is 7 times the speed of the car

p = 7c

The distance traveled is

d = 315 km

The time difference to travel this same distance is 3 hours.

d = ts, where d- distance, t- time, s - speed

Find the time for car and plane and their difference.

t = d/s = 315/c

<h3 /><h3>Plane</h3>

t = d/s = 315/p = 315/(7c) = 35/c

<h3 /><h3>The difference</h3>

315/c - 45/c = 3

Solve it for c:

(315 - 45)/c = 3
270/c = 3
c = 270/3
c = 90 km/h

Now find the speed of plane:

p = 7c = 7*90 = 630 km/h

As we see, Jenny is right

6 0

2 years ago

Ayudeme a resolver y poner signo positivo y negativo

Lina20 [59]

Debido a restricciones de extensión y la características del ejercicio, recomendamos leer la explicación de esta pregunta para mayores detalles sobre la adición de números enteros.

<h3>¿Cuáles son los resultados de cada suma?</h3>

En este ejercicio tenemos un grupo de sumas con números enteros positivos y negativos, en las cuales se prueba la capacidad del estudiante para realizar varias operaciones en serie (adición, sustracción) y comprender las diferencias entre números positivos, negativos y neutros. Ahora procedemos a determinar el resultado de cada una de las expresiones:

20 + 50 + 30 + 7 = 107

30 + 5 + 2 = 37

- 200 - 50 - 70 - 8 = - 328

- 500 + 100 - 20 + 50 = - 370

10 - 5 = 5

20 + 50 - 25 - 10 = 35

- 100 + 20 = - 80

- 30 + 5 + 4 - 20 + 8 = - 33

- 258 + 8 = - 250

- 10 + 20 + 520 - 100 + 8 = 438

- 20 - 5 - 42 + 3 = - 64

1000 - 200 + 50 + 30 - 45 + 75 - 87 + 90 + 50 - 100 + 50 - 10 = 903

- 400 + 500 - 200 - 50 + 48 + 8 - 47 - 50 = - 191

300 + 20 - 50 + 30 - 84 + 35 - 7 + 20 - 40 + 10 - 45 + 65 + 8 - 55 = 207

800 + 50 - 69 + 8 - 35 + 85 - 54 + 40 + 85 + 74 - 32 - 8 + 65 - 27 = 982

Para aprender más sobre sumas: brainly.com/question/1456841

#SPJ1

4 0

1 year ago

Kathi's order at the diner cost $12.75. She had to pay 6% tax on the bill. How much is her tax?

Talja [164]

$\begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{6\% of 12.75}}{\left( \cfrac{6}{100} \right)12.75}\implies 0.765~~\approx 0.77~~\textit{about 77 cents}$