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3 years ago

12

the price of a pair of headphones at store a is 3/4 the price at store a the price at store a is 89.25 find how much you save by

buying the headphones at storE a

1 answer:

melomori [17]3 years ago

6 0

Answer:22.31

Step-by-step explanation:

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A savings and loan association needs information concerning the checking account balances of its local customers. A random sampl

Citrus2011 [14]

Answer:

a) 98% confidence interval for the true mean checking account balance for local customers.

(453.586 , 874.693)

b) 95% confidence interval for the standard deviation.

(214.91 , 441.53)

Step-by-step explanation:

Given a size of sample 'n' =14

given mean of the sample x⁻ = $664.14

standard deviation of the sample 'S' = $297.29.

a)

<u>98% of confidence intervals</u>

<u></u> $(x^{-} - t_{\alpha } \frac{S}{\sqrt{n} } , x^{-}+ t_{\alpha }\frac{S}{\sqrt{n} } )$ <u></u>

The degrees of freedom γ=n-1 =14-1 =13

t₁₃ = 2.650 at 98% of confidence level of signification.

$(664.14- 2.650\frac{297.29}{\sqrt{14} } , 664.14+ 2.650\frac{297.29}{\sqrt{14} } )$

on calculation, we get

(664.14-210.553 , 664.14+210.553)

(453.586 , 874.693)

98% confidence interval for the true mean checking account balance for local customers.

(453.586 , 874.693)

<u>95% of confidence intervals</u>

$({s\sqrt{\frac{n-1}{X^{2} _{(\frac{\alpha }{2} ,n-1) } } } ,s\sqrt{\frac{n-1}{X^2_{\frac{1-\alpha }{2},n-1 } } } )$

The degrees of freedom γ=n-1 =14-1 =13

X^2_{0.05,13} =22.36 (check table)

X^2_{0.95,13} = 5.892 (check table)

$(297.29. (\sqrt{\frac{14-1}{X^2_{0.05,13} } } ),297.29(\sqrt{\frac{14-1}{X^2_{0.95,13} } } )$

$(297.29. (\sqrt{\frac{14-1}{22.36 } } ),297.29(\sqrt{\frac{14-1}{5.892 } } )$

(214.91 , 441.53)

95% confidence interval for the standard deviation.

(214.91 , 441.53)

7 0

3 years ago

Can someone show me how to do this

Aleksandr [31]

Well the answer is d I think lol I haven't done this equation in a while

6 0

3 years ago

Read 2 more answers

Which values make the inequality 3x – 8 ≤ 46 true?

murzikaleks [220]

Answer:

-22 ans -46

Step-by-step explanation:

3x – 8 ≤ 46 add 8 to the both sides

3x ≤ 54 divide both sides by 3

x ≤ 18 if x is equal or smaller than 18 the values -22 and -46 can make the inequality true

6 0

2 years ago

Find the area of the triangle, please hurry and show your work

Anna71 [15]

The area= (20x14)/2
So, 20 times 14, divided by 2.

3 0

3 years ago

Read 2 more answers

The perimeter of a rectangle is 44. The length is 5 less than double the width. What is the length?

OleMash [197]

$44 = 2x - 5 \\ \frac{39}{2} = \frac{2x}{2} \\ 19.5 = x \\$

4 0

2 years ago