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kirill [66]
3 years ago
10

Alice wants to prove to her parents that listening to music while she does her homework will help her get better grades. She dec

ides to ask 25 of her friends if they listen to music while they do their homework and what their grades are. She finds that her friends who have high grades also listen to music while they do their homework. She tells her parents that she has proven that listening to music while doing homework will cause her grades to improve. What mistake has Alice made?
A) She did not separate her friends into different groups, and she didn't apply a treatment.
B) She did not separate her friends into different groups, and she used a survey to collect data.
Mathematics
1 answer:
Leona [35]3 years ago
8 0
The answer would be A.

Explanation: First off, she did not separate her friends into different groups. Secondly, she only got information from the students who listen to music. She should've gotten information from the students who don't listen to music in order to compare her results. She needed to make the survey equal meaning that, she needed to survey the students who listen to music and the ones that don't.
You might be interested in
Determine the greatest common divisor of the elements of the set \[ s = \{ n^{13} - n \mid n \in \mathbb{z} \}. \]
Kay [80]

Answer:

2730

Step-by-step explanation:

We want to determine the greatest common divisor of the elements of the set  S = \{ n^{13} - n \mid n \in \mathbb{Z} \}.

We apply the Fermat's little theorem which states that if p is a prime number, then for any integer a, the number aᵖ − a is an integer multiple of p.

Now, n^{13} \equiv n \mod p if p-1 divides 12.

Since the  of 12 are 1,2,3,4, 6, 12, the corresponding primes are 2, 3, 5, 7, 13.

Therefore, the gcd of the elements in 2^{13}-2 and 3^{13}-3$ is 2 \cdot 3 \cdot 5 \cdot 7 \cdot 13.

2*3*5*7*13=2730

Therefore, the gcd of the elements in set S is 2730.

5 0
3 years ago
What is the largest three-digit number that is a multiple of both $24$ and $30$
irina [24]

We are given two numbers $24 and $30.

We need to find the largest three-digit number that is a multiple of both $24 and $30.

So, we need to find the largest common multiple of 24 and 30.

<em>In order to find the largest common multiple, we need to multiply both numbers.</em>

If we multiply 24 and 30, we would get

24 × 30 = 720.

Therefore, the largest three-digit number that is a multiple of both $24 and $30 is 720.



4 0
3 years ago
A rectangle has an area of 1/6 square centimeters and a length of 1.5 centimeters. What is the width? What is the perimeter?
UkoKoshka [18]

Answer:

follow me please please

4 0
3 years ago
Can someone explain to me how to do this?
elena55 [62]
In the slope intercept form equation of a line (y=ax+b) a represents the slope, and b represents the intercept, which is -5. Thus, we know y=ax-5. The slope can be found by creating a fraction with the change in y value on top, and the change of x value on the bottom. If we have two points (4, 1) and (0, -5) we can put this into a fraction - \frac{-5-1}{0-4}, which simplifies down to -6/-4, or 3/2. Thus the answer is f(x)=\frac{3}{2}x-5<span />
6 0
3 years ago
How do you factor this so you can find the roots or what x equals?
Marina86 [1]
Use the rational roots test.  The possible roots are: plus/minus 6,3,2,1

Use synthetic division and you will see that 3 is a root:

3 | 1 -3 -3 11 -6
   |    3  0  -9  6
   ____________
     1 0  -3   2 0

Use rational root again, to see that possible roots are: plus/minus 2,1

Try 2:

2 | 1 0 -3 -2
   |    2  4  2       
   _____________
     1  2  1  0

The above is x^2+2x+1 which is a perfect square: (x+1)^2

So we have the final factorization: (x-3)(x-2)(x+1)^2

So the roots are: 3, 2, -1
Where -1 is a double zero.

6 0
2 years ago
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