Answer:
Jeff found the ratio of boys to students. He needed to first find that there are 14 girls to get a ratio of 10:14 or 5:7.....answer is the first one
Step-by-step explanation:
brainly.com/question/5872696
Answer:
Total number of minutes in 2 days = 2880
Total time used for recycling garbage in 2 days = 2880/3 = 960
If 3 minutes = 1/2 tons
Then 960 minutes = 960*1/2 = 960/2 = 480
Therefore <u>480</u> tons of garbage where recycled in 2 days
1. 3x + 5x + 14x = 22x
2. 4x + 7 + 11x = 15x+7
3. 10x + 8 - 3x= 7x+8
4. 6x - 5 + X - 11 = 7x-16
5. -8x + 19 + 2 - 2x = -10x+21
6. X + 23 + 4x - 34 - X = 4x-11
7. 105 + 27x - 68 - 19x - 27 + x = 9x +10
8. 7x + 16 - 3x + 3 - 2x - 2x = 19
9. -18 + 6 - 4x + 10 - 11x + 2 = -15x
10. 16 + 4x - 12x - 28 - 6x + 17 + x - 1 = -13x+4
Answer:
Step-by-step explanation:
Hello!
The objective of the research is to compare the newly designed drug to reduce blood pressure with the standard drug to test if the new one is more effective.
Two randomly selected groups of subjects where determined, one took the standard drug (1- Control) and the second one took the new drug (2-New)
1. Control
X₁: Reduction of the blood pressure of a subject that took the standard drug.
n₁= 23
X[bar]= 18.52
S= 7.15
2. New
X₂: Reduction of the blood pressure of a subject that took the newly designed drug.
n₂= 21
X[bar]₂= 23.48
S₂= 8.01
The parameter of study is the difference between the two population means (no order is specified, I'll use New-Standard) μ₂ - μ₁
Assuming both variables have a normal distribution, there are two options to estimate the difference between the two means using a 95% CI.
1) The population variances are unknown and equal:
[(X[bar]₂-X[bar]₁)±
*(
)]


[23.48-18.52]±2.018*(
)]
[0.349; 9.571]
2) The population variables are unknown and different:
Welche's approximation:
[(X[bar]₂-X[bar]₁)±
*(
)]


[(23.48-18.52)±2.018
]
[0.324; 9.596]
I hope this helps!