To test the effectiveness of a new, cholesterol-lowering drug, a group of researchers recruits 200 volunteers with high cholesterol to take part in a study. The researchers place the numbers 1 through 200 in a hat and have each participant select a number. Those who picked an odd number receive the new drug, while those who picked an even number receive a placebo. Which experimental design are the researchers using?
a. Representative Sample Design
b. Completely Randomized Design
c. Matched-Pair Design
d. Randomized Block Design

Answers

Answer 1

Answer:

c. Matched-Pair Design

Step-by-step explanation:

The experimental research study showcased above exhibits two different treatments groups ; the new cholesterol lowering drug and the placebo. The allocation of observations or subjects into groups was based on pair selection which is based on whether subjects picked an even or odd number. Subjects who picked the odd are moved to the treatment group of the new drug while those who picked an even number are referred to the placebo treatment group. This type of research design which involves two pairs of treatment and allotment pattern is called a matched pair research design

Answer 2

Answer:

Completely Randomized Design

Step-by-step explanation:

Rationale: When all patients aer assigned treatment or control randomly without considering other factors, this is called a cmpletely randomized design.


Related Questions

plssss helpppp ILLL GIVE BRAINLESS

Answers

Answer:

C

Step-by-step explanation:

i think

PLS ANSWER ASAP THANKS TO YOU!

Answers

Answer:

3

Step-by-step explanation:

9.

12. Sana makatulong

Solve for X
2x - 8 = 30

Answers

Answer:

x=19

Step-by-step explanation:

2x - 8 = 30

get x by itself by adding 8 to both sides

2x=38

divide by 2

x=19

DOES ANYONE KNOW THIS???!?!?​

Answers

Answer:

15%

Step-by-step explanation:

56-32/32×100

24/32×100=75

100-75=15%

Answer:

15%

Step-by-step explanation:

A store pays $27 for a ticket to a play and marks the price up by 39%. What is the amount
of the mark-up?

Answers

Answer:

first, lets find 39% of 27.

39% of 27=10.53

10.53+27=

37.53

What is - 0.9 as a decimal

Answers

Answer: -0.9 as a decimal is -0.9

but if you meant as a fraction, then it's -9/10

Step-by-step explanation:

Answer:

0.9

Step-by-step explanation:

There Are Several Ways To Write 0.9.

1) 0.9

2)0.90

3)9/10

4)90/100

Hope this was able to help you!

-TheAnimeCatUwU

#LearnWithBrainly

Jacob and Jackson are having a fishing competition.
Each boy adds the lengths of all the fish he catches,
and the winner is the one with the greatest total length of fish.
The following shows the lengths of the fish each boy caught.

Jacob: 512in., 818in.,678in.,1234in.

Jackson: 634in., 578in., 718in., 634in., 514in.

Who won the competition and by how much?

Answers

Answer:

a

Step-by-step explanation:

because Jackson has the most numbers so it would make more sense for it to be a tell me if I'm right or wrong

4 wholes and 3/8 - 2 wholes and 1/8. Those are the problems. Help me answer them please.

Answers

Answer:

c 2 and 2/8

Step-by-step explanation:

you subtract the wholes first which is 4 - 2 = 2

and then the fractions 3/8 - 1/8 = 2/8

Answer:

C

2 2/8

Step-by-step explanation:

An engineer makes a model of a bridge using a scale of 0.5 cm = 3 feet. The length of the actual bridge is 123 feet. What is the length of the model?

Answers

Answer:

20.5 cm

Step-by-step explanation:

Set up a proportion where x is the length of the model in cm:

[tex]\frac{0.5}{3}[/tex] = [tex]\frac{x}{123}[/tex]

Cross multiply and solve for x:

3x = 61.5

x = 20.5

So, the model's length is 20.5 cm

A farmer sells 7.8 kilograms of pears and apples at the farmer's market. 3/4 of this weight is pears, and the rest is apples. How many kilograms of apples did she sell at the farmer's market? ;)​

Answers

Given that a farmer sells 9.5 kilograms of apples and pears at the farmer's market and of the weight is the apples and the rest is the pears.
We are to find the number of kilograms of pears that she sold at the farmer's market.
Given that
of the weight of 9.5 kilograms is the apples.
So, the total weight of the apples is given by

Therefore, the weight of the pears is given by

Thus, the farmer sold 1.9 kilograms of pears at the farmer's market.

The farmer sold 1.95 kg of apples at the farmer's market.

What is an expression?

In mathematics, expression is defined as the relationship of numbers, variables, and functions using mathematical signs such as addition, subtraction, multiplication, and division.

Given that a farmer sells 7.8 kilograms of pears and apples at the farmer's market. 3/4 of this weight is pears, and the rest is apples.

Since 3/4 of the weight is pears, then 1/4 of the weight must be apples.

We can find 1/4 of the weight by dividing 7.8 by 4:

7.8 kg ÷ 4 = 1.95 kg

So the farmer sold 1.95 kg of apples at the farmer's market.

To know more about an expression follow

https://brainly.com/question/15605133

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pls help me for 100 points!

Answers

Answer:

160

Step-by-step explanation:

Answer: 160

Step-by-step explanation:

Find the value of x.
b
(23x+1)
52°
3

Answers

Answer:

Step-by-step explanation:

Adjacent angles when a line crosses another line must have a sum of 180 degrees.

52+2^(3x+1)=180

2^(3x+1)=128, 128=2^7 so

2^(3x+1)=2^7 which means

3x+1=7

3x=6

x=2

Determine if the sequence is Arithmetic or Geometric:
16, 8, 4, ?

Answers

Answer:

It is geometry

Step-by-step explanation:

HELP FAST FAST FAST PLS ILL LOVE YOU FOREVER <3
Mr. Lewis showed his friend part of the prime factorization of 70. Fill in the missing factor.
2 x _ x 7

Answers

Answer:

5

Step-by-step explanation:

2x5x7=70

A soccer team must raise at least $660 buy new equipment. To reach this goal, each of the 12 soccer players sells tickets
to a game. Tickets cost $2.75 each. The school athletics fund donates an additional $10 per player. The situation is
modeled by the inequality shown,

12(2.75r + 10) 660

How many tickets must each player sell to raise the money?

A at least 19
B at least 17
C at least 16
D at least 20

Answers

Answer:

At least 17

Step-by-step explanation:

12(2.75r+ 10)≥ 660

33r+120≥ 660

33r≥ 540

r≥ 16.36

You can't sell 0.36 of a ticket to they need at least 17

2+2=5 if im not wrong

The distance between R and S on the coordinate grid is units. (Input whole numbers only) Numerical Answers Expected! Answer for Blank 1​

Answers

Answer:

45 units

Step-by-step explanation:

0.45m-9=0.9m
Subtract 0.45m from both sides

Answers

Answer:

Step-by-step explanation:

If you're trying to isolate the variable the first thing you would want to do is actually add 9 to both sides.

Answer:

-9 = 0.45m

Step-by-step explanation:

0.45m - 9 -0.45m= 0.9m - 0.45m

(-3x10^3) x (4x10^6)

Answers

Answer:

not sure but i got -12000000000 in the calculator

Step-by-step explanation:

−12x1001001 if you are simplifying

Determine the domain of the following graph:

Answers

Hi there! :)

[tex]\large\boxed{[-6, 6]}[/tex]

The domain of a graph consists of its x-values.

In this graph, we can see endpoints at the value x = -6 and x = 6.

Thus, the domain is from x = -6 to 6.

Since we have endpoints, however, we can use closed brackets "[]" to denote the domain in interval notation. Therefore, the domain of this function is:

[-6, 6].

Solve. What is the area of the shape above in square inches?

Answers

so the inches well be 3,840 inche

Step-by-step explanation:

I got 465 because there are 4 triangles so 8x15/2x4 plus 15x15

If K = {(x, y) Ix-y=5), is Set K a function?
1. Νο
2. Yes

Answers

Answer:

no its not

Step-by-step explanation:


At a store, a hat has a regular price of x dollars. During sale, the price of the hat
is discounted by 20%. The expression 0.8x describes the discounted price, in dollars,
of the hat. Which expression also describes the discounted price, in dollars, of the hat?

Answers

Answer:

x - 0.2x

Since the price of the hat is labelled = x,

The percentage discount on the hat price = 20%,

Thus, the discount = 20% of the price marked

= Twenty percent of x

=0.2 x =0.2 x

Therefore, the hat's new price = Marked price - Discount

= x- 0.2  = x

Answer:

D) x - 0.2x

Step-by-step explanation:

The hat has a regular price of x dollars.

This price is reduced by 20% so the relevant expression for the discount is; 20% * x or; 0.2x

The discounted price will be the price of the hat less the discount which means the formula will be;

= Price - discount

= x - 0.2x

Find the 76th term on the arithmetic sequence
4, 7, 10, 13

Answers

Answer:

229

Step-by-step explanation:

1) the difference of the sequence is:

d=7-4=10-7=13-10=3.

2) the common view of the formula of the n term is:

a(n)=a(1)+d*(n-1), where n - required number of the term (it is 76), d- the calculated difference, a(1) - the 1st term of the given sequence.

3) according to the formula above it is possible to substitute n=76, d=3 and 4, then:

a(76)=4+3*(76-1)=4+225=229.

is 4.92 repeating irrational or rational ?

Answers

Answer:

Irrational, since it doesn't have a definite value. (It's not like 3.75 or 5)

Hope that helps!

Step-by-step explanation:

You are in charge of renting SUVs and vans for your family reunion, and you want to minimize costs. You know that at most 40 children are attending and that at least 36 adults are attending. Each SUV accommodates 4 children and 3 adults, and costs $85 to rent. Each van accommodates 4 children and 4 adults, and costs $95 to rent. A. Set up the linear programming problem by writing the objective function as well as the system of constraints. B. How many SUVs and vans should be rented to minimize cost

Answers

Answer:

4 SUV, 6 vans

Step-by-step explanation:

Let x represent the number of SUV rented, and let y represent the number of vans to be rented.

Each SUV accommodates 4 children while Each van accommodates 4 children. Since there are at most 40 children who are attending, hence:

4x + 4y ≤ 40          (1)

Also, Each SUV accommodates 3 adults while Each van accommodates 4 adults. Since there are at most 36 adults who are attending, hence:

3x + 4y ≥ 36          (2)

The system constraints are:

4x + 4y ≤ 40          (1)

3x + 4y ≥ 36          (2)

x, y ≥ 0

b) The SUV cost $85 to rent and the van cost $95 to rent. Therefore the cost equation is:

Cost = 85x + 95y

From the graph, the solution to the constraints are (0, 10) and (4, 6).

At (0, 10); Cost = 85(0) + 95(10) = $950

At (4, 6); Cost = 85(4) + 95(6) = $910

Therefore the minimum cost is at (4,6). That is only 4 SUV and 6 vans should be rented

HURRY ANSWER Determine whether the graph shows a positive correlation, a negative correlation, or no correlation. If there is a positive on
negative correlation, describe its meaning in the situation.
Consumer Price Index, 1950-2002
700
600+
500
400
300
200+
100
1950
1960
1970
1980
1990
2000
Year
Source: Bureau of Labor Statistics, U.S. Dept. of Labor
a. no correlation
b. positive correlation; as time passes, the CPI increases.
C.positive correlation as time passes

Answers

Answer:

B

Step-by-step explanation:

The meaning in the situation is B; positive correlation; as time passes, the CPI increases.

What does correlation coefficient convey?

The correlation coefficient is the degree of association between two quantities in terms of linear relation. The range of correlation coefficient is -1 to 1

If the correlation is -1, then that refers as the one quantity increases, the other quantity decreases , also the correlation is 0, then there is no linear relationship between two variables.

There are two types of Correlation;

Positive Correlation= With Increase in x value, y value also increases, we call it positive correlation.

Negative Correlation= With Increase in x value, if y value decreases, we call it negative correlation.

As we can see from the points plotted on the graph ,with increase in x value , y value decreases.

Hence, positive correlation; as time passes, the CPI increases.

Learn more about correlation coefficient here:

https://brainly.com/question/10725272

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The first three terms of a sequence are given. Round to the nearest thousandth (if
necessary).
24, 12, 6, ...
Find the 8th term.
Help

Answers

Answer:

[tex]\frac{3}{16}[/tex]

Step-by-step explanation:

The common ratio is [tex]\frac{1}{2}[/tex]

24, 12, 6, 3, [tex]\frac{3}{2}[/tex], [tex]\frac{3}{4}[/tex], [tex]\frac{3}{8}[/tex], [tex]\frac{3}{16}[/tex]

so divide each term by 2

plz mark m brainliest. :)

Solve y2 = 64, where y is a real number.
Simplify your answer as much as possible.

Answers

Answer:

See step by step

Step-by-step explanation:

If you are referring to

[tex]y {}^{2} = 64[/tex]

Then the answer is 8 or -8,

If you are referring to

[tex]y \times 2 = 64[/tex]

Then answer is 32 or -32 it depends on which one you are referring to.

find the area of each polygon I DONT GET IT SO PLZ HELP SOMEONE

Answers

Answer:

Step-by-step explanation:

Count each sides :)

Answer:

DONT DOWNLOAD THE DOC IT GIVES YOU A VIRUS WHERE U TYPE IN ALL CAPS

Step-by-step explanation:

Factor 25b – 14b
b(25 – 14)
b(25 + 14)
-b(25 – 14)
-b(25 + 14)

Answers

[tex]\huge\text{Hey there!}[/tex]

[tex]\large\text{We cannot do much of nothing because we don’t have all the information}\\\large\text{to solve.. so we can just simply do process of elimination until we fully find}\\\large\text{the ANSWER you are trying to look for.}[/tex]

[tex]\large\text{Given equation: 25b - 14b}\\\large\text{COMBINE your LIKE TERMS}\\\large\text{\underline{25b - 14b} = 11b}\\\large\text{So, we are looking for an equation that gives us \bf{11b}}[/tex]

[tex]\large\text{Option A.}\downarrow\\\large\text{b(25 - 14)}\\\large\text{DISTRIBUTE: b(25) + b(-14)}\\\bullet\large\text{ Reverts to: 25b - 14b (our ORIGINAL EQUATION) so this can be}\\\large\text{equal to 11b}\\\\\large\text{Option A. could POSSIBLY be your ANSWER}[/tex]

[tex]\large\text{Option B. }\downarrow\\\large\text{b(25 + 14)}\\\large\text{Distribute}\\\large\text{25(b) + 14(b)}\\\large\text{It DOES NOT revert to the original equation. It gives us: 25b + 14b}\\\large\text{If we COMBINE your LIKE TERMS in that equation. We would get: 39b}\\\large\bf{39b \neq 11b}\\\\\large\text{Option B is NOT your ANSWER}[/tex]

[tex]\large\text{Options C and D CANNOT be your answers because Option C. is}\\\large\text{-11b and Option D. is -39b}[/tex]

[tex]\boxed{\boxed{\large\text{To sum it all up, your ANSWER is: \bf{Option A. b(25 - 14)}}}}\huge\checkmark[/tex]

[tex]\text{Good luck on your assignment and enjoy your day!}[/tex]

~[tex]\frak{Amphitrite1040:)}[/tex]

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