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.
Answer:
9
a
2
b
4
3
a
3
b
3
Step-by-step explanation:
$2.00=100%-25%=75%
50%=$1.00
so that means 75% =$ 1.50
Your answer is B. -125 4/27
Answer:
C. 
Step-by-step explanation:
We have been given a diagram of an oblique prism and we are asked to choose the expression that represents the volume of the prism.
Since we know that an oblique prism is a prism in which the bases are parallel, but the faces are not directly one over the other.
The volume of an oblique prism is base area multiplied by the height.
We can see from our diagram that our prism has an square base as each side of base equals x units.
We can also see from our given diagram that it has a height of (x-2) units and slant height of (x+1) units.
Since volume of oblique prism is base area times by the height (not slant height). So upon substituting the height and base area of our given prism in volume formula we will get,
Therefore, the volume of our given prism is and option C is the correct choice.
