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Ugo [173]
3 years ago
9

A study by Goldstein et al. (1997) examined the effect of playing video games on the reaction time of elderly individuals. Volun

teers in the experimental group played the puzzle game Tetris five hours a week for five weeks. Control group participants did not play the game. At the end of the study Goldstein et al. rejected the null hypothesis. What does this mean?
Mathematics
1 answer:
sweet-ann [11.9K]3 years ago
6 0

Answer:

Step-by-step explanation:

Hello!

The study hypothesis was that playing videogames improves the reaction time on elderly individuals. If so, then the average reaction time on the elderly that played videogames is less than the average reaction time of elderly that do not play video games.

In the null hypothesis, the researchers usually state the known information or the possibility that the experiment has no effect, in this case, that playing video games doesn't modify the average reaction time in the elderly. If this hypothesis was rejected, this means that playing videogames increases significantly the reflexes in elderly individuals and reduces their reaction time.

I hope it helps!

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You need 660 mL of a 40% alcohol solution. On hand, you have 35% alcohol mixture. You also have a 95% alcohol mixture. How much
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Answer:

A. 605 mL of the 35% solution

B. 55 mL of the 95% solution

Step-by-step explanation:

It is given that, you need 660 mL of a 40% alcohol solution. On hand, you have 35% alcohol mixture. You also have a 95% alcohol mixture.

Let x and y be the amount of 35% alcohol solution and 95% alcohol solution (in mL) respectively.

So,

Amount equation: x+y=660        ...(1)

Alcohol equation : 0.35x+0.95y=0.40(660)\Rightarrow 0.35x+0.95y=264     ...(2)

On solving (1) and (2), we get

0.35(660-y)+0.95y=264

231-0.35y+0.95y=264

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y=\dfrac{33}{0.6}

y=55

Now, substitute y=55 in (1).

x+55=660  

x=660-55  

x=605  

Therefore, we need 605 mL of the 35% solution  and 55 mL of the 95% solution.

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