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

Answers

Answer 1

Answer: 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.

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From a set of eight marbles, five red and three white, we choose one at random. What are the odds in favor of choosing a red marble?

|3k-2|=2|k+2| what is k

Answers

Answer:

k = 6

Step-by-step explanation:

|3k-2| = 2|k+2|

3k - 2 = 2k + 4

k - 2 = 4

k = 6

The box plots below show the distribution of salaries, in thousands, among employees of two small companies.Which measures of center and variability would be best to use when making comparisons of the two data sets?

Answers

Answer:

mean and Interquartile Range (IQR)

Step-by-step explanation:

If AB = 4x +10, BC = 2x +3 and AC= 9x - 15 find AC. and show work plzz !!!!

Answers

Answer:

Step-by-step explanation:

AB + BC = AC

4x + 10 + 2x + 3 = 9x - 15

6x + 13 = 9x - 15

6x + 13 + 15 = 9x

6x + 28 = 9x

3x = 28

x = 9 1/3 = 28/3

AC = 9 * 28/3 - 15

AC = 3 * 28 - 15

AC = 84 - 15

AC = 69

Find the missing side b.
A. 16.1
B. 19.7
C. 26
D. 13

Answers

Answer: A . 16.1

Step-by-step explanation:

In the figure we have a right triangle in which one of the leg's length is missing.

Pythagoras theorem of right triangles says that the square of hypotenuse is the sum of the squares of the two legs.

For the given triangle , we have $(18)^2=b^2+8^2$

i.e. $\Rightarrow\ 324=b^2+64$

i.e. $\Rightarrow\ b^2=324-64$

i.e. $\Rightarrow\ b^2=260$

i.e. $\Rightarrow\ b=√(260)=16.1245154966approx16.1$

Hence, the missing side = 16.1 units

16.1. Solve by using the Pythagorean Theorm. b squared+8 squared= 18 squared. b squared+64=324. Subtract 64 from both sides to get b squared=260. Square root 260 to get 16.1

I will upvote the right answerWithout multiplying, determine the sign of the product (−247,634)(183,758).

The sign of the product is positive because a negative multiplied by a positive is a positive.

The sign of the product is negative because a negative multiplied by a positive is a negative.

The sign of the product is negative because the first number is negative.

The sign of the product is positive because the second number is positive.

Answers

I believe the correct answer is The sign of the product is negative because a negative multiplied by a positive is a negative.
However, the third answer: The sign of the product is negative because the first number is negative is not necessarily incorrect.
Even so, I think the second choice (The sign of the product is negative because a negative multiplied by a positive is a negative.) is more likely to be the answer they wanted.
Hope this helped!! xx

when two positive numbers are being multiplied/divided, the answer is going to be positive.
when two negative numbers are being multiplied/divided, the answer is going to be positive.
when a negative and a positive numbers are being multiplied/divided, the answer is going to be negative.

Solve photo question help please.

Answers

4x-8y=0
-3x+8y=-7

x=2y
-6y+8y=-7
2y=-7

y=-3.5
x=7

There is just 1 solution.

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The square of a number exceeds that number by 12. What are the two possible solutions?3 or -4 3 or 4 -3 or 4