Note :- If sample size n > 30 OR Population standard deviation σ is given then We use Z test.
If sample size n < 30 AND Population standard deviation σ is unknown then we use t test.
In this question we are not given Population standard deviations σ1 and σ2.
Also n1 = 14 and n2 = 13 both sample sizes are LESS than 30.
Therefore we use t test.
Given :- Assume the population standard deviations are equal. ( σ1 = σ2)
then Degrees of freedom = n1 + n2 - 2 = 14 + 13 - 2 = 25.
(kindly find the image attached with this solution)
Answer :- Therefore 25 degrees of freedom are used to find the t critical value.
2/cos x
........................
Answer:
4.2
Step-by-step explanation:
3.5 x 1.2 = 4.2
Answer:
13/14
Step-by-step explanation:
The GCF between 26 and 48 is 2. So divide 26/2=12 and 48/2=13 13/14. And after that you can not simplify anymore so 13/14 is 26/48 in it's simplest form.
Hope it helps!
The equation that offers the best approximation to this result is: 
. (Choice D)
<h3>How to find the free fall formula for a given scenario</h3>
An object experiments a free fall when it is solely accelerated by gravity on the assumption of an <em>uniform</em> acceleration. The formula is described below:
(1)
Where:
- Initial height, in feet.
- Initial speed, in feet per second. 
- Time, in seconds. 
- Gravitational acceleration, in feet per square second.
If we know that 
, 
, 
, 
, then the height formula is:
The equation that offers the best approximation to this result is: . (Choice D)
To learn more on free fall, we kindly invite to check this verified question: brainly.com/question/13796105
