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Alchen [17]
3 years ago
5

You test calories for a food item. The brand name has a mean of 158.706 and a sample standard deviation = 25.236, when seventeen

are tested. The generic item has a mean of 122.471 and a sample standard deviation = 25.183, when seventeen are tested. Which is a confdence interval of 95%?
Multiple Choice: (Show work)

A) 17.21 to 55.26
B) 18.12 to 54.35
C) 17.79 to 54.67
D) 18.622 to 53.848
Mathematics
1 answer:
jarptica [38.1K]3 years ago
4 0

Answer:

option C

Step-by-step explanation:

given,

\bar{x_1} = 158.706, \sigma_1 = 25.36 , n_1= 17

\bar{x_1} = 122.471, \sigma_1 = 25.183 , n_2= 17

α = 1 - 0.95 = 0.05

degree of freedom (df) = 17 -1 = 16

critical value= t_{\alpha/2},df = t_{0.025},16 =2.120 (from t-table)

margin of error = t_{\alpha/2}\sqrt{\dfrac{s_1^2}{n_1}+\dfrac{s_2^2}{n_2}}

=2.120\times \sqrt{\dfrac{25.36^2}{17}+\dfrac{25.183^2}{17}}[/tex]

= 2.120 x 8.6467

= 18.33

Margin of error = 18.33

Point estimation of difference = \bar{x_1} - \bar{x_2}

                                                  = 36.235

lower limit = 36.235 - 18.33 = 17.91

upper limit = 36.235 + 18.33 = 54.57

hence, the nearest option near to answer is option C

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19/30

Step-by-step explanation:

The probability of an event happening or a event not happening is 30/30

30/30 - 11/30 = 19/30

There the answer is 19/30

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Joe spends S3 per square foot on carpet for a square room. If he spends
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Answer:

12 square feet

Step-by-step explanation:

You can find out how many square feet he bought by dividing 432 by 3.

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Now, you need to find the square root of that to find the length of just one side of the room.

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perimeter of circle=2πr

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2 years ago
Solve.
Nat2105 [25]

The solution to the algebraic equation, −0.4x − 3.1 = 5.9, is:<u> x = -22.5</u>

Given the algebraic equation, −0.4x−3.1 = 5.9, to solve for x, follow the steps below:

−0.4x − 3.1 = 5.9

  • Add 3.1 to both sides

−0.4x − 3.1 + 3.1 = 5.9 + 3.1

-0.4x = 9

  • Divide both sides by -0.4

-0.4x/-0.4 = 9/-0.4

x = -22.5

Therefore, the solution to the algebraic equation, −0.4x − 3.1 = 5.9, is:<u> x = -22.5</u>

<u></u>

<u></u>

Learn more here:

brainly.com/question/16864747

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Add 3 to both sides:

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Divide by 2 on both sides:

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3 years ago
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