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qaws [65]
3 years ago
10

An energy drink company claims that its product increases students' memory levels. To support its claims, the company issues adv

ertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. The missing component in this study is a
A) control group B) sample group C) population D) test group
Mathematics
2 answers:
dexar [7]3 years ago
8 0
A) control group, they did not also survey 10 other ppl who took a placebo 
gladu [14]3 years ago
3 0

Answer: A) control group


Step-by-step explanation:

  • A control group is a group of participants who are used for comparing another group to in a test or experiment. It is composed of participants who do not receive the experimental treatment.

In the given situation an energy drink company claims that its product increases students' memory levels.

To support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory.

But they haven't compose a control group to compare the results for test.

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You buy 3 shirts and 1 pair of pants for $32. Your friend buys 2 shirts and 3 pairs of pants for $40.
koban [17]

You buy 3 shirts and 1 pair of pants for $32. Your friend buys 2 shirts and 3 pairs of pants for $40. How much did each item cost?

 

First let’s define a shirt as X and pants as Y!

 

In the first scenario, the equation will be 3X + Y =$32

In the second scenario, the equation will be 2X + 3Y = $40  

 

Now because we have two different variables (X & Y) let’s solve for one of them (Ex: Y) to simplify the equations!

 

3X + Y= $32—> subtract 3X on both sides of the equation  

-3X.        - 3X

 

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Now we can insert this into the second equation 2X + 3Y = $40 in order to solve for X variable  

 

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Now reinsert 8= X into 3X + Y = $32

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24+ Y = $32 —> substract 24 from both sides

y = 8

   

ANSWER: X= 8, Y= 8

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