Answer:
Step-by-step explanation:
The formula for determining the confidence interval for the difference of two population means is expressed as
Confidence interval = (x1 - x2) ± z√(s²/n1 + s2²/n2)
Where
x1 = mean sale amount for mail order sales = 82.70
x2 = mean sale amount for internet sales = 66.9
s1 = sample standard deviation for mail order sales = 16.25
s2 = sample standard deviation for internet sales = 20.25
n1 = number of mail order sales = 17
n2 = number of internet sales = 10
For a 99% confidence interval, we would determine the z score from the t distribution table because the number of samples are small
Degree of freedom =
(n1 - 1) + (n2 - 1) = (17 - 1) + (10 - 1) = 25
z = 2.787
Margin of error =
z√(s²/n1 + s2²/n2) = 2.787√(16.25²/17 + 20.25²/10) = 20.956190
Answer:
ESTA EN IGLES
Step-by-step explanation:
Answer:
50 ft³
Step-by-step explanation:
As your question is incomplete
Assuming diagram in the attachment shows a triangular prism:
(a) Calculate the volume of the prism if l = 5 ft.
A triangular prism has the same triangular cross-section throughout its length.
Volume = area of cross-section × length
= 10 ft² × 5 ft
= 50 ft³
Answer:
V = 432 m³
Step-by-step explanation:
The volume (V) of a prism is calculated as
V = Ah ( A is the area of the base and h the height )
A = bh ( area of triangular base, with b the base, h the perpendicular height)
Here b = 16 and h = 6 , then
A = × 16 × 6 = 8 × 6 = 48 m²
Then
V = 48 × 9 = 432 m³
The correct answer is x=20
Here step by step:
X/5=4
5 X x/5=5 X 4
X=20