1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
KonstantinChe [14]
3 years ago
14

A school teacher wants to survey students at her elementary school. She surveys 20 students from each grade level. What type of

sampling technique she is using
Mathematics
1 answer:
Elan Coil [88]3 years ago
4 0

Answer:

Stratified Random sampling

Step-by-step explanation:

When a random observations are selected from a number of individual groups in a particular population, the type of sampling technique is called Stratified Random sampling. Stratified Random sampling begins with the partitioning or splitting or a population into subgroups. A number of random selection are then made from each of the subgroups to form a collection of larger samples. This is different from the simple random sampling technique which makes random selection directly from a larger sample or population without prior partitioning of the population. The different grades of students represents the individual stratum from which random selections are made.

You might be interested in
K is the midpoint of PQ, P has
Pachacha [2.7K]

Answer:

Coordinates of Q (x_2,y_2) \:are\: \mathbf{(7,16)}

Option D is correct option.

Step-by-step explanation:

We are given:

K is the midpoint of PQ

Coordinates of P = (-9,-4)

Coordinates of K = (-1,6)

We need to find coordinates of Q  (x_2,y_2)

We will use the formula of midpoint: Midpoint=(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})

We are given midpoint K and x_1,y_1 the coordinates of P we need to find x_2,y_2 the coordinates of Q.

Midpoint=(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})\\(-1,6)=(\frac{-9+x_2}{2},\frac{-4+y_2}{2})\\

Now, we can write

-1=\frac{-9+x_2}{2}, 6=\frac{-4+y_2}{2}\\Simplifying:\\-2=-9+x_2\:,\: 12=-4+y_2\\-2+9=x_2\:,\: 12+4=+y_2\\x_2=7\:,\:y_2=16

So, we get coordinates of Q (x_2,y_2) \:are\: \mathbf{(7,16)}

Option D is correct option.

6 0
3 years ago
An equation parallel and perpendicular to 4x+5y=19
mestny [16]

Answer:

An equation parallel to 4x + 5y = 19 would be y = -4/5x +12.

An equation perpendicular to 4x + 5y = 19 would be y = 5/4x + 10.

Step-by-step explanation:

The equation given represents a linear equation in Standard Form (Ax + By = C).  Lines that are parallel to each other go the same direction and don't touch, so their slopes must be the same.  However, lines that are perpendicular go in opposite directions and intersect, so their slopes must be the direct opposite of each other.  In order to find the slope, you must first convert from the Standard Form given to Slope Intercept Form (y = mx +b).  When you solve the given equation for 'y', you get: y = -4/5x + 19, where the slope = -4/5.  To make a parallel equation, simply keep the same slope and choose a different y-intercept ('b').  To make a perpendicular equation, take the direct opposide of your slope 5/4 (positive) and choose a different y-intercept.  

8 0
3 years ago
Need help asap!!! (will give BRAINLEIST)
madam [21]

Answer:

false

Step-by-step explanation:

rainbow method or tabular method x^2+4x+4

7 0
3 years ago
Read 2 more answers
Keri is making a doll clothes for a holiday craft show. The wholesale cost of the materials for one outfit is $9.38. If she sell
irinina [24]

Answer:

60%

Step-by-step explanation:

If I get you right, you're asking for the percentage gain to the nearest percentage, right?

Now to do this, we need to get the amount of profit she made. That's quite easy, we only need to subtract the cost price from the selling price. And that equals $15 - $9.38 that equals $5.62.

Now, we divide this value by the cost price and multiply by 100% to get the percentage gain.

I.e 5.62/9.38 × 100%.

That gives 59.9% , which equals 60% when approximated to the nearest percentage.

5 0
3 years ago
What number belongs in the space next to 10? Look at pic. A)19 B)18 C)17 D)16 E)15
AleksandrR [38]

the equation is 2x-1 right so all you have to do is plug and go

2x-1

2x10-1

20-1

19

so your answer would be A)19

5 0
3 years ago
Other questions:
  • Joe's pizzeria sells pizzas topped with olivies. To stay within budget, number of olives on each pizza is given by the equation
    12·2 answers
  • I need help please look at the picture thx
    12·1 answer
  • Luke opened a savings account with a balance of $0.00 and deposited $20.00. During the next 2 weeks, he made two more deposits f
    6·2 answers
  • Which of the following pairs of expressions could represent consecutive odd numbers?
    8·2 answers
  • How do you solve -6x+5t=-30
    13·1 answer
  • You and your friend decide to go to Red Robin to eat. You are both part of the rewards club and receive coupons in the mail. You
    9·1 answer
  • Are x and y proportional?
    5·2 answers
  • Kevin went car shopping. The scatterplot at the right shows the relationship between the number of miles each of the cars had an
    15·1 answer
  • For the base b of a logarithmic function, b&gt;0 and b≠1<br><br><br> True<br><br> False
    11·1 answer
  • 2(2 + 6v)<br><br> Help I don’t know how to solve this :( help pls and quick
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!