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Volgvan
3 years ago
11

Suppose we have collected times, in minutes, that it takes volunteers to complete a set of pencil and paper mazes. Volunteers ar

e randomly assigned to one of two groups. Group 1 watch a 5 minute video explaining good strategies for completing the mazes. Group 2 watch a 5 minute video of other people successfully completing the mazes, but with no explanation given.Researchers are interested in testing against the null hypothesis that there is no difference in population mean times that it takes people to complete mazes after watching either type of video.There are the summary statistics after collecting data. Note that the sample sizes differ, because some subjects did not follow instructions correctly and so they were not included in the analysis.x1 = 11.98, x2 = 9.15s1 = 8.69, s2 = 7.75n1 = 43, n2 = 52a. Is this an experimental or observational study?
Mathematics
1 answer:
Leto [7]3 years ago
3 0

Answer:

Is an experimental study

Step-by-step explanation:

In an observational study you don't control any aspect of the investigation you just observe the variables that you determined since the beginning without any intervention.

In this case you are controlling who sees one or the other video, then you are controlling one of the variables that is the type of video each group sees and because of this it is an experimental study. Researchers designed an experiment to prove the null hypothesis they had.

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snow_tiger [21]
Set the equation equal to zero.

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or -2/3

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add 6 to both sides
10x=6
Divide by 10 on both sides
x=6/10 or 4/5

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-14 from both sides
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divide both sides by 5
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3 years ago
Ama bought 12 eggs at $1.10 each. If 3 of the eggs got broken and sold the remaining at $1.45 each, calculate the
kkurt [141]

Answer:

1.1%

Step-by-step explanation:

cost price=1.10×12

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loss= cost price-selling price

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2 years ago
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Damm [24]

Answer:

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Step-by-step explanation:

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3 a - 4 a = -a:

Answer: -a^2 + -a + 12

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