2 years ago

HELPPP FOR BRAINELST RIGHT NOW PLEASE

Mathematics

1 answer:

Aliun [14]2 years ago

3 0

Answer:

its 12

Step-by-step explanation:

F1= 12N F2 = 24 F3 = 12N and thats how u get 12 i think lol

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A study is done to find the 95% confidence interval for the difference in means between the ACT scores between two schools in a

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Solution :

95% confidence interval for the difference between the means of ACT scores between two schools, is given by :

$[(\overline X_1 - \overline X_2)-ME, (\overline X_1 - \overline X_2)+ME]$

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$S_1=3.49, \ \ \ S_2 = 2.47$

$n_1=39, \ \ n_2=37$

M.E. , Margin of error,

$=t_{n_1+n_2-2,0.025} \times \left( s \sqrt{\frac{1}{n_1}+\frac{1}{n_2}}$

$s^2 = \frac{(n_1-1)S_1^2+(n_2-1)S^2_2}{n_1+n_2-2}$

$=\frac{38(3.49)^2+36(2.47)^2}{39+37-2}$

= 9.222

s = 3.03

$t_{74,0.05} = 1.99$

$M.E. = 1.99 \times 3.03 \times \sqrt{\frac{1}{39}+\frac{1}{37}}$

= 1.4

Therefore, 95% CI = [(25.90-27.70) - 1.4 , (25.90-27.70) + 1.4]

= [-3.2, -0.4]

Therefore, the lower bound is -3.2

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2 years ago

The diagonal length of a kite is multiplied by 8. Which of the following describes the effect of this change on the area? HELP P

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Step-by-step explanation:

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The answer is A, D, and E because when you add them up they give you 28.3

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3 years ago