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frosja888 [35]
3 years ago
12

A company is testing a new protein shake which they claim works better than their existing brand in improving an athlete's perfo

rmance. The company selected 60 athletes from a training camp database, and divided them into three groups. The ages for the groups were 16 to 20 years, 21 to 25 years, and 26 to 30 years. In each group, half of the subjects were asked to use the new protein shake for a month, and the other half were asked to use the company's existing brand for a month. The subjects were not informed about which protein shake they would be using. Which statements about this study are true? The study uses blocking to reduce variability from known factors. The study does not use a control group. The study uses random sampling. The study uses blocking on the basis of gender. The study uses a repeated measure design to reduce variability from unknown factors.
Mathematics
1 answer:
stepladder [879]3 years ago
8 0

Answer:

The study uses random sampling

The study uses blocking to reduce variability from known factors

Step-by-step explanation:

Correct on Plato/Edmentum

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Using substitution <br> x+3y=3<br> 3y-2x=12
frez [133]

Step-by-step explanation:

<u>Given </u><u>:</u><u>-</u>

  • x + 3y = 3
  • 3y - 2x = 12

And we need to solve the equation using Substituting method . So on taking the first equation ,

\rm\implies x + 3y = 3 \\\\\rm\implies x = 3 - 3y

<u>Put </u><u>this</u><u> </u><u>value</u><u> </u><u>in </u><u>(</u><u>ii)</u><u> </u><u>:</u><u>-</u><u> </u>

\rm\implies 3y - 2x = 12 \\\\\rm\implies 3y - 2(3-3y)=12\\\\\rm\implies 3y -6-6y = 12 \\\\\rm\implies -3y = 18 \\\\\rm\implies y = -6

<u>Put </u><u>this</u><u> </u><u>Value</u><u> </u><u>in </u><u>(</u><u>I)</u><u> </u><u>:</u><u>-</u><u> </u>

\\\\\rm\implies x = 3-3*-6 \\\\\rm\implies x = 3+18 \\\\\rm\implies x = 21

<u>Hence</u><u> the</u><u> </u><u>Value</u><u> </u><u>of </u><u>x </u><u>is </u><u>2</u><u>1</u><u> </u><u>and </u><u>y </u><u>is </u><u>(</u><u>-</u><u>6</u><u>)</u><u> </u><u>.</u>

4 0
3 years ago
Read 2 more answers
Write an inequality to represent the situation. <br> A cheese pizza costs at least $5.
Nady [450]
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-  5 dollars, the V thing sits on top of the line and 5 comes after signifying that it could be 5 dollars or more
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Determine which answer is reasonable to 4.8 times 9.2<br><br>A. 14<br>B. 45.36<br>C. 432<br>D. 470.4
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B. is reasonable because 9.2×4.8 = 44.16
4 0
3 years ago
Is a positive integer raised to a negative power always positive
Evgesh-ka [11]

Answer:

Yes

Step-by-step explanation:

Many students gets confused with these exponential problems, they often get misguided but understand that there is nothing to be confused of.

When you have a negative number, you just take the reciprocal of the whole exponent number.

What is a reciprocal?

Let's take an integer for example, let's take the number 3.

The reciprocal for 3 is (1/3)

Let's take an other number, let's take 2/3

The reciprocal for 2/3 is (3/2)

In conclusion, we just reverse the denominator and the numerator or just switch it.

We take 3 as (3/1) and that is the reason, the reciprocal would be (1/3)

Now, coming to the negative integers. Taking an example:

(2)⁻¹

This would be become (1/2¹) = (1/2)

Hence, the result of a negative integer is positive but would be a fraction.

Hope I helped!


3 0
3 years ago
1/5 (5x-15) -2x <br><br> What is the question ?? <br> How do I solve the problem ??
Ksenya-84 [330]

<u>Answer:</u>

-x-3

<u>Step-by-step explanation:</u>

<em>They want you to simplify the expression.</em>

<u>Step 1:</u><em> Apply the distributive property.</em>

\frac{1}{5} (5x)+\frac{1}{5} (-15-2x)

<u>Step 2:</u> <em>Cancel the common factor of 5.</em>

x+\frac{1}{5} (-15-2x)

<u>Step 3:</u> <em>Cancel the common factor of 5.</em>

x-3-2x

<u>Step 4:</u> <em>Subtract 2x from x.</em>

-x-3

8 0
3 years ago
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