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ZanzabumX [31]
2 years ago
15

Alma wants to prove to her parents that listening to music while she studies for her tests will help her get better grades. She

decides to ask 15 of her friends if they listen to music while they study for tests and what their grades are. She finds that her friends who have high grades also listen to music while they study for tests. She tells her parents that she has proven that listening to music while studying for tests will cause her grades to improve. What mistake has Alma made?
Mathematics
2 answers:
Nikolay [14]2 years ago
6 0
She asked her friends, which does not represent a random sample.

She tried to show cause and effect without doing an experiment (which includes simple random sample, control group, treatment, etc).

So the answer is she did not use a random sample, and tried to show cause and effect with an observational study.
inn [45]2 years ago
5 0

Answer:

She did not use a random sample, and she tried to show cause and effect with an observational study.

Hope this Helps! Mark Brainliest Please!


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dmitriy555 [2]

Answer:

6  \frac{2}{5}

Step-by-step explanation:

6 is the whole number, while 2 is the numerator and 5 is the denominator.

4 0
3 years ago
The scheduled arrival time for a daily flight from Boston to New York is 9:35 am. Historical data show that the arrival time fol
Lady_Fox [76]

Answer:

The mean is 11.5 minutes and the standard deviation is of 6.64 minutes

Step-by-step explanation:

An uniform probability is a case of probability in which each outcome is equally as likely.

For this situation, we have a lower limit of the distribution that we call a and an upper limit that we call b.

The mean is:

M = \frac{a+b}{2}

The standard deviation is:

S = \sqrt{\frac{(b-a)^{2}}{12}}

Arrival time of 9:18 am and a late arrival time of 9:41 am.

9:41 is 23 minutes from 9:18. So the time is uniformily distributed between 0 and 23 minutes, so a = 0, b = 23.

Mean:

M = \frac{a+b}{2} = \frac{0+23}{2} = 11.5

Standard deviation:

S = \sqrt{\frac{(b-a)^{2}}{12}} = \sqrt{\frac{(23 - 0)^{2}}{12}} = 6.64

The mean is 11.5 minutes and the standard deviation is of 6.64 minutes

8 0
2 years ago
The sum of two numbers is 12 and their difference is 18 what are the two numbers
lawyer [7]

Answer:


Step-by-step explanation:

x+y=12

x-y=18

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then solve for y.

15+y=12

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3 0
3 years ago
Use the formula aequals upper p left parenthesis 1 plus r right parenthesis superscript t to find the rate r at which ​$3000 com
hichkok12 [17]
The answer is 7,323 al you have to do is pay atention
7 0
3 years ago
Read 2 more answers
10 ft
muminat
10+8+8.9+4=30.9
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3 0
3 years ago
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