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Viefleur [7K]
3 years ago
14

What is the difference between experiments and surveys

Mathematics
1 answer:
muminat3 years ago
5 0
A survey is a practice of asking a particular group of people for their thoughts on a product or issue, an Experiment is the practice of doing a comprehensive study on a n issue with the aim of proving it scientifically. 

A survey is based on public opinion whereas an experiment is is putting in work to see the outcome, using trials and different ways of experimentation 
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Previously, an organization reported that teenagers spent 24.5 hours per week, on average, on the phone. The organization thinks
Lena [83]

Answer:

We need to develop a one-tail t-student test ( test to the right )

We reject H₀  we find evidence that student spent more than 24,5 hours on the phone

Step-by-step explanation:

Sample size  n = 15     n < 30

And we were asked if the mean is higher than, therefore is a one-tail t-student test ( test to the right )

Population mean   μ₀  = 24,5

Sample mean   μ  =  25,7

Sample standard deviation s = 2

Hypothesis Test:

Null Hypothesis      H₀                             μ  =  μ₀

Alternative Hypothesis     Hₐ                  μ  >  μ₀

t (c) =  ?

We will define CI = 95 %  then   α = 5 %   α = 0,05    α/2 =  0,025

n = 15     then degree of freedom    df = 14

From t-student table  we get:  t(c) = 2,1448

And  t(s)

t(s) = ( μ  -  μ₀  ) / s/√n

t(s) = (25,7 - 24,5) /2/√15

t(s) = 2,3237

Now we compare   t(c)   and  t(s)

t(c)  =  2,1448         t(s)  = 2,3237

t(s) > t(c)

Then we are in the rejection region we reject H₀   we have evidence at 95% of CI that students spend more than 24,5 hours per week on the phone

8 0
2 years ago
What is the value of x if x =3^2​
ycow [4]

Answer:

9

Step-by-step explanation:

Raise 3 to the power of 2.

5 0
2 years ago
Can anybody helppp meee please
crimeas [40]

Answer:

r^2=(A/pi)

Step-by-step explanation:

if A=pi*r^2 then maybe dividing by pi to get r^2 alone says r^2=(A/pi) or to get rid of the exponent you may square root each side so r=(sqrt(A/pi))

3 0
3 years ago
Can someone plz help me idk how to do it
pshichka [43]
At first glance the answer seems like 3
u should draw it out
6 0
2 years ago
Fraction has a value thats equal to 7/8
kvv77 [185]
If you mean whats equivalent it's........21/24
5 0
3 years ago
Read 2 more answers
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