A large pharmaceutical company is trying to determine whether a drug aptly named Recall-Pro can increase your short-term memory capacity. The company prepares a double-blind study as follows: Step 1: A randomly selected pool of individuals is brought to a clinic and is evaluated for any existing health conditions that may impair the results of this experiment. Step 2: The remaining individuals are split into two groups: a treatment group and a control group. Step 3: The control group receives a placebo, but neither the researcher nor the individuals know this. Step 4: The treatment group receives Recall-Pro, but neither the researcher nor the individuals know this. Which step is flawed in the double-blind study? Why? A.Step 1; health screening should not eliminate participants from the study B.Step 2; it does not specify whether the two groups are chosen randomly C.Step 3; the control group does not receive the placebo D.Step 4; members of the treatment group should know that they have received the medication

QUESTION POSTED AT 18/01/2020 - 06:45 AM

Answered by admin AT 18/01/2020 - 06:45 AM

The best answer to the question that is being stated above would be letter B. Step 2 is the one that is flawed in the double-blind study because it does not specify that the two groups were randomly chosen. It is important to assign the participants randomly so that the results give a non-confounded result.
Post your answer

Related questions

I need help on 2 and 3

A then c ok so I think wait nope I'm right

ANSWERED AT 21/02/2020 - 09:42 AM


QUESTION POSTED AT 21/02/2020 - 09:42 AM

1.) what do values a h and k tell about the graph 2.) graph function 3.) state domain/range 4.) are there any intercepts? List all

Attached is a very useful chart for translations. [https://us-static.z-dn.net/files/df7/85ffaebe52d207009f6ed5967a5e05b4.jpg]

A number added or subtracted outside of parentheses shifts the graph vertically up (if number is added) or down (if number is subtracted).
As you can see in the chart,
f(x) + k shifts the graph up k units, and
f(x) - k shifts the graph down k units.

A number that is multiplied to x outside parentheses stretches or shrinks the graph vertically. If that number is greater than 1, then it stretches the graph. If the number is a fraction or between 0 and 1, then it shrinks the graph vertically.

As you can see in the chart,
a * f(x), where a>1 stretches the graph f(x) vertically by a factor a.
a * f(x), where a is between 0 and 1 shrinks the graph f(x) vertically by a factor of a.

When h is added or subtracated from x inside the parentheses, the graph is shifted horizontally right or left. Remember that this is opposite of what the sign is:
If h is positive, f(x + h), then the graph shifts left h units.
If h is negative, f(x - h), the graph shifts right h units.
Note that the attached chart uses c instead of h.

Since the function will be quadratic (degree is 2), the domain will be all real numbers, from -infinity to +infinity (-∞, +∞).
Depending on whether the value of a is positive or negative, the graph will open up like a U (if a is positive) or open down like an upside down U (if a is negative).

Since the equation is in vertex form f(x) = a(x - h)^2 = k, the vertex is (h, k). The range (set of y-values) will be from y-coordinate of the vertex (k) to positive or negative infinity depending on whether the graph opens up or down. 

ANSWERED AT 21/02/2020 - 09:41 AM


QUESTION POSTED AT 21/02/2020 - 09:41 AM

How many solutions can be found for the equation 5x + 3(x − 1) = 10x − 2x − 3? None One Two Infinitely many

Answer:

Option (d) is correct.

The equation 5x + 3(x − 1) = 10x − 2x − 3 will have infinite many solution.

Step-by-step explanation:

  Given : the equation 5x + 3(x − 1) = 10x − 2x − 3

We have to find the number of solution to the equation 5x + 3(x − 1) = 10x − 2x − 3

Consider the given equation 5x + 3(x − 1) = 10x − 2x − 3

This can be written as two equations as

y=5x + 3(x-1)   .........(1)

and y = 10x − 2x − 3 ......(2)

Simplify, both the equations,

y=5x + 3x - 3 = 8x - 3  

and y = 10x − 2x − 3 = 8x -3

Since, both equations are same.

So, the graph of both equation will overlap each other.

Hence,  the equation 5x + 3(x − 1) = 10x − 2x − 3 will have infinite many solution.

ANSWERED AT 21/02/2020 - 09:26 AM


QUESTION POSTED AT 21/02/2020 - 09:26 AM

If Circle A ~ Circle B, Circle A has a radius of 4, and Circle B has a radius of 2, what is the scale factor?

You would put circle A and circle B in a fraction form and then reduces it to simplest form so I am gonna put circle A on top then circle B on bottom 4/2 which reduces down to 2 circle A is 2 times bigger then circle B

ANSWERED AT 21/02/2020 - 09:16 AM


QUESTION POSTED AT 21/02/2020 - 09:16 AM

Help please Solve for z. 5z – 8 = 32 A) z = 4 B) z = 6 C) z = 8 D) z = 4.8

5z-8=32
+8. +8
5z= 40
5/5=40/5
Z=8

ANSWERED AT 20/02/2020 - 11:22 PM


QUESTION POSTED AT 20/02/2020 - 11:22 PM

Tony misplaced 7 77 stamps from his collection. He knows that each stamp of his is worth $ 0 . 1 5 $0.15dollar sign, 0, point, 15 and that the total value of them is now only $ 5 . 5 5 $5.55dollar sign, 5, point, 55.

I take it that only 7 stamps are misplaced and that we are asked for the total value of the stamps including those which have been misplaced. 
If each is worth $0.15 then, the total worth of 7 stamps is $1.05. Then, we add this value to the value of his remaining stamps, $5.55, the answer would be $6.60. 

ANSWERED AT 20/02/2020 - 11:20 PM


QUESTION POSTED AT 20/02/2020 - 11:20 PM

What are the x-intercepts of the quadratic function? y = x² + x – 2 1 2 and 1 2 and –1 –2 and 1

Your answer should be the last one, -2 and 1. Hope this helps!

ANSWERED AT 20/02/2020 - 11:20 PM


QUESTION POSTED AT 20/02/2020 - 11:20 PM

. What is the distance around a 2 Dimensional Shape?

The total distance around a closed shape (such as a rectangle) is known as the perimeter. 

ANSWERED AT 20/02/2020 - 11:20 PM


QUESTION POSTED AT 20/02/2020 - 11:20 PM

In 4 years, harry’s age will be the same as jim’s age is now. in 2 years, jim will be twice as old as harry will be. find their ages now.

The answer to this question would be:
Jim     =6 years
Harry =2 years

To answer this question, you need to translate the description into a  mathematical equation. If H= Harry's ages and J= Jim's ages, then the equation should be look like this:

1. H+4= J
2. (J+2)= 2(H+2)
     J+2= 2H+4
     J= 2H +2

If you put the 1st and 2nd equation together, the result would be:
H+4= J
H+4= (2H +2)
H-2H= 2-4
-H= -2
H=2

After that insert the H value to either 1st or 2nd equation.
H+4= J
2+4=J
J= 6

ANSWERED AT 20/02/2020 - 11:19 PM


QUESTION POSTED AT 20/02/2020 - 11:19 PM

If x-y=8,find the value of y when x=3

3-y=8
-y=8-3
y=-5
so just try to re arrange the equation  to find the value for the variable

ANSWERED AT 20/02/2020 - 11:18 PM


QUESTION POSTED AT 20/02/2020 - 11:18 PM

If i take 2 cookies and had 2 more cookies, how many cookies do i have

4 an there is your answer

ANSWERED AT 20/02/2020 - 11:18 PM


QUESTION POSTED AT 20/02/2020 - 11:18 PM

If i run 10 kilometers in 1 hour how many kilometers do i run in 2 and a half hours

10 kilometers per hour
in 2.5 hours distance = 10 * 2.5 = 25 kilometers

ANSWERED AT 20/02/2020 - 11:18 PM


QUESTION POSTED AT 20/02/2020 - 11:18 PM

How many times does 4 go into 85??

4 goes into 85, 21.25 times
4 x 21 = 84
4 x .25 = 1
84 + 1 = 85

ANSWERED AT 20/02/2020 - 11:16 PM


QUESTION POSTED AT 20/02/2020 - 11:16 PM

Half day hike in 4 hours you hike 10 miles what is the unit rate?

2.5 miles/hour

Because 10 divided by 4 = 2.5

ANSWERED AT 20/02/2020 - 11:14 PM


QUESTION POSTED AT 20/02/2020 - 11:14 PM

In the form f(x)=a(x-h)^2+k

Vertex is (h,k)
se see vertex is (1,-4)
y=a(x-1)^2-4
find a
another point is (4,-2)

-2=a(4-1)^2-4
-2=a(3)^2-4
-2=9a-4
add 4
2=9a
divide b 9
2/9=a


f(x)= \frac{2}{9}(x-1)^2-4

ANSWERED AT 20/02/2020 - 11:14 PM


QUESTION POSTED AT 20/02/2020 - 11:14 PM

Find the value of 2a 5b when a=-6 and b=2

2a = -12

5b = 10

Hope this helps
:)

ANSWERED AT 20/02/2020 - 11:14 PM


QUESTION POSTED AT 20/02/2020 - 11:14 PM

Find the nth term of this sequence -2 3 8 13 18

The nth term is 5n-7

ANSWERED AT 20/02/2020 - 11:14 PM


QUESTION POSTED AT 20/02/2020 - 11:14 PM

Evaluate 2.34 x 10 cubed

2.34 x 10 cubed
2.34 x 1000
2,340

ANSWERED AT 20/02/2020 - 11:13 PM


QUESTION POSTED AT 20/02/2020 - 11:13 PM

Decide whether the following rates are equivalent. 12 pages in 20 minutes or 20 pages in 32 minutes

The two fractions that we can extract from the given rates above are:
                (1) 12 pages / 20 minutes
                (2) 20 pages / 32 minutes
We can reduce the fractions or rates to their lowest term by dividing the numbers by 4 such that,
                 (1) 3 pages / 5 minutes
                 (2) 5 pages / 8 minutes
Therefore, the rates are not equivalent. 

ANSWERED AT 20/02/2020 - 11:12 PM


QUESTION POSTED AT 20/02/2020 - 11:12 PM

Corn cost 2$ for 6 ears . carmen bought 24 ears of corn. how much did she spend?

2/6=x/24
6x=48
x=8 dollars

ANSWERED AT 20/02/2020 - 11:12 PM


QUESTION POSTED AT 20/02/2020 - 11:12 PM

What is the distance between two points whose coordinates are (-2,5) and (3,-4)?

Disance between (x1,y1) and (x2,y2) is
D= \sqrt{(x2-x1)^2+(y2-y1)^2}
given (-2,5)  (3,-4)
D= \sqrt{(3-(-2))^2+(-4-5)^2}
D= \sqrt{(5)^2+(-9)^2}
D= \sqrt{25+81}
D=√106
the distance is √106 units or abotu 10.2

ANSWERED AT 20/02/2020 - 11:11 PM


QUESTION POSTED AT 20/02/2020 - 11:11 PM

What is the common ration of 10, 9, 1, 8, -7, 15?

It would be 4 becuase that is the middle 2 numbers multiplied then didvided by 2

ANSWERED AT 20/02/2020 - 11:11 PM


QUESTION POSTED AT 20/02/2020 - 11:11 PM

Ill give a tip please explain the steps Use this table as a reference for your interest rate percentages. Secured Unsecured Credit APR (%) APR (%) Excellent 4.80 5.25 Good 5.15 5.65 Average 5.85 6.20 Fair 7.00 7.65 Poor 8.20 9.15 8. You (or your parents) purchase a new car for $19,725.00 plus 4.75% sales tax. The down payment is $2,175.00 and you (or your parents) have an average credit rating. How much interest is accrued after the first month? (2 points) 9. You (or your parents) purchase a used car for $15,867.00 plus 5.25% sales tax. The down payment is 10% of the total cost and you (or your parents) have an excellent credit rating. What is your principal balance at the start of the loan? (2 points) 10. You (or your parents) are debating about whether to buy a new car for $19,072.00 or a used car for $15,635.00. Sales tax is 4.5%. You (or your parents) plan to make a down payment of $1,200.00 and your credit rating is fair. What is the difference in interest accrued by the end of the first month? (

Divide the APR by 360 days and multiply it by 30 days to get the monthly interest. Each loan is usually secured by the car you bought. So we will use the secured APR.

8. Average rating secured apr: 5.85% divide by 360 multiply by 30:  0.4875% monthly rate
Cost of car: 19,725 ; sales tax: 4.75% ; down payment: 2,175

19,725 x 1.0475 =  20,661.94 - 2,175 = 18,486.94 loan amount
18,486.94 x 0.4875% = 90.12 accrued interest for the 1st month.

9. Excellent rating secured apr: 4.80% divide by 360 multiply by 30: 0.40% monthly rate
Cost of car: 15,867 ; sales tax: 5.25% ; down payment: 10% of total cost

15,867 x 1.0525 =  16,700.02 x 90% = 15,030.02 the principal balance at the start of the loan.

10. Fair rating secured apr: 7% divide by 360 multiply by 30: 0.5833% monthly rate
Cost of new car: 19,072 ; sales tax: 4.5% ; down payment: 1,200
Cost of used car: 15,365; sales tax: 4.5% ; down payment: 1,200

19,072 x 1.045 = 19,930.24 - 1,200 = 18,730.24
18,730.24 x 0.5833% = 109.25 accrued interest

15,365 x 1.045 = 16,056.43 - 1,200 = 14,856.43
14,856.43 x 0.5833% = 86.66 accrued interest

109.25 - 86.66 = 22.59 is the difference in interest accrued by the end of the first month.

ANSWERED AT 20/02/2020 - 11:06 PM


QUESTION POSTED AT 20/02/2020 - 11:06 PM

HURRY I'LL PICK A BRAINLIEST!!! Solve the equation for a. K = 4a + 9ab A. a = K(4 + 9b) B. a = 4(K + 9b) C. a = 4+9b/K D. a = K/4+9b

Answer:

Step-by-step explanation:

A

ANSWERED AT 20/02/2020 - 11:06 PM


QUESTION POSTED AT 20/02/2020 - 11:06 PM

126 point every 3 games 210 point every 3 games

What are you trying to ask here?

ANSWERED AT 20/02/2020 - 11:05 PM


QUESTION POSTED AT 20/02/2020 - 11:05 PM

$12,500 car , 3 3/4 % tax

Including the tax, the total would be $12,968.75

ANSWERED AT 20/02/2020 - 11:05 PM


QUESTION POSTED AT 20/02/2020 - 11:05 PM