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Marina86 [1]
3 years ago
10

Which of the following needs to be true in order to show that AXYZ - ADEF by

Mathematics
1 answer:
Vedmedyk [2.9K]3 years ago
7 0

Answer:

I think it's answer is B. XY-DE.

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The thicknesses of 81 randomly selected aluminum sheets were found to have a variance of 3.23. Construct the 98% confidence inte
Yuliya22 [10]

Answer:

The confidence interval for the population variance of the thicknesses of all aluminum sheets in this factory is Lower limit = 2.30, Upper limit = 4.83.

Step-by-step explanation:

The confidence interval for population variance is given as below:

[(n - 1)\times S^{2}  /  X^{2}  \alpha/2, n-1 ] < \alpha < [(n- 1)\times S^{2}  / X^{2} 1- \alpha/2, n- 1 ]

We are given

Confidence level = 98%

Sample size = n = 81

Degrees of freedom = n – 1 = 80

Sample Variance = S^2 = 3.23

X^{2}_{[\alpha/2, n - 1]}   = 112.3288\\\X^{2} _{1 -\alpha/2,n- 1} = 53.5401

(By using chi-square table)

[(n – 1)*S^2 / X^2 α/2, n– 1 ] < σ^2 < [(n – 1)*S^2 / X^2 1 -α/2, n– 1 ]

[(81 – 1)* 3.23 / 112.3288] < σ^2 < [(81 – 1)* 3.23/ 53.5401]

2.3004 < σ^2 < 4.8263

Lower limit = 2.30

Upper limit = 4.83.

8 0
2 years ago
Alfred works for a graphic design firm. He is making a poster to raise awareness for global warming. Which type of poster is he
12345 [234]

Answer: The answer is A

Step-by-step explanation: The answer is A because he is try to spread awareness for global warming which is informative.

6 0
3 years ago
By 8:00 a.M,, the snack bar had made 3,256 in sales. By noon the snack bar total sales were 8,821 About how much money did snack
marissa [1.9K]
5,565, if you subtract the 2 numbers
6 0
3 years ago
It's all on the picture ​
sammy [17]

Answer:

i believe its 24+12

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
The ratio of the number of hamsters to the number of mice in a pet store is 3 to 2. How many hamsters are there, if there are 12
aleksandrvk [35]

Answer:

18

Step-by-step explanation:

you can do 12/2 to get 6 (the scale factor) and then multiply 3 by 6 and get 18

6 0
3 years ago
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