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Zinaida [17]
4 years ago
11

An experiment was carried out to determine the effect of providing free milk to school children in a certain district (Lanarkshi

re, Scotland). Some children in each school were chosen for the treatment group and got free milk, others were chosen for controls and got no milk. Assignment to treatment or control was done at random, to make the two groups comparable in terms of family background and health. After randomization, teachers were allowed to use their judgment in switching children between treatment and control, to equalize the two groups.
Are these statements true or false?
A. This is a probability sample
B. This is a simple random sample.
C. There is selection bias
D. There is non-response bias
Mathematics
1 answer:
Semmy [17]4 years ago
5 0
The answer to this is a
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If the point (a,3) lies on the graph of the equation 5x + y = 8 then a =?
Contact [7]

Answer:

a = 1

Step-by-step explanation:

Given the point (a, 3) is on the line: 5x + y = 8.

Any point on the line satisfies the equation.

So, (a, 3) should satisfy the equation 5x + y = 8

Substituting x = a and y = 3, we get:

5(a) + 3 = 8

$ \implies 5a = 5 $

⇒ a = 1

Therefore, (1, 3) is the point on the line.

3 0
3 years ago
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KATRIN_1 [288]

Answer:

1,125

Step-by-step explanation:

I think this might be right if not sorry!

7 0
3 years ago
Please Help with math word problem.
motikmotik

Answer:

Adult Tickets: 173

Student Tickets: 43

Explanation:

  • To solve this problem, you'll need to set up a system of equations.
  • Assume a = # of adult tickets sold
  • Assume s = # of student tickets sold

2: a + s = 216; 1: 10.25a+ 8s= 2117.25

2: <<As the total number of tickets sold from both sides is equal to 216>>

1: <<Each adults ticket (a) costs $10.25 and each student ticket (s) costs $8, and the total amount of money earned (2117.25) from sales is the combination of these two))>>

  • Note that there are two ways to solve systems of equations (by elimnation and substitution), in this case I'll use elimnation as substitution requires one of the variables in one of the two equations to be isolated.

  • In this case, I'll elimnate a.

a + s = 216

10.25a + 8s = 2117.25

  • In order to elimnate a, it has to be equal to - 10.25 so that it cancels out + 10.25 (so you have to multiply everything on the first equation by 10.25 ((what you do to one part, you'll do to all the other parts)).

-10.25a -10.25s = -2214

10.25a + 8s = 2117.25

  • a cancels, and now you solve accordingly.

-2.25s/-2.25 = -96.75/-2.25

s = 43

  • You could solve for a using this same method, but it's easier to use the first formula <<a+s=216>> to find a.

a + 43 = 216

- 43 -43

a = 173

4 0
3 years ago
Solve the equation. Show all of your work. 1/59X + 60) = 2/3x- 2
vivado [14]

Step-by-step explanation:

1/5x+60=2/3x-2

subtract 1/5x from 2/3x

when you do that you should get 0.46x repeating

then you add two to 60

you should get 62

62=0.46x

divide x

you get 134.7

8 0
3 years ago
What is the answer to 12 - 2m + 5 = -1. show step by step wrk
Vladimir [108]

Answer:

9

Step-by-step explanation:

Picture attached.....

5 0
3 years ago
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