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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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Answer:

The rearrangement can be 45, 987 , 310

Step-by-step explanation:

Here, we want to rearrange the number such that 9 is worth 10 times as what it is worth presently

The value of 9 presently is 90,000

So 10 times as worth will be 10 * 90,000 = 900,000

So we can have the new arrangement as;

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3 years ago
The accountant charged $35 for the first hour of work and $23 for each hour after that.He earned a total of$127 how many hours d
dexar [7]

Answer:

He worked a total of 5 hours.

Step-by-step explanation:

The first hour the man makes $35 dollars for the first hour then for the other hours he earns $23 dollars, right? So we start off with 35.

35 = one hour.

35 + 23 = 2 hours .  =  58.

35  + 23 + 23 = 3 hours. =  81.

35 + 23 + 23 + 23 = 4 hours.  =  104.

35 + 23 + 23 + 23 + 23 = 5 hours. =  127.

We were looking for if the man earned $127 dollars how many hours would be be working.


He'd be working 5 hours.

Hope this helps (:


5 0
3 years ago
100 students participate in sport or music.60 participate in sports and 50 participate in music. How many students participate i
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Answer:

since there's only 100 students how can 60 participate in sport and 50 participate in music, that must mean there is 110 students right?

3 0
3 years ago
Read 2 more answers
With the air conditioner on, the electric bill was $303. With the air conditioner off, the bill was $194. What was the differenc
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Answer:

<em>$</em><em>1</em><em>0</em><em>9</em><em> </em><em>is</em><em> </em><em>the</em><em> </em><em>difference</em><em> </em><em>between</em><em> </em><em>both</em><em> </em><em>the</em><em> </em><em>bills</em>

Step-by-step explanation:

<em>Difference</em><em> </em><em>=</em><em>$</em><em>(</em><em>3</em><em>0</em><em>3</em><em>-</em><em>1</em><em>9</em><em>4</em><em>)</em>

<em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em>=</em><em>$</em><em>1</em><em>0</em><em>9</em>

<em>Hope</em><em> </em><em>this</em><em> </em><em>helps</em>

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Answer:

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Step-by-step explanation:

So, we first need to find out how many numbers fit the "less than 29 or odd" group.

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Finally, we put the first number (7) over the total (9) = \frac{7}{9}

\frac{7}{9} is now able to be written in a percentage, if you need.

The probability is \frac{7}{9} OR 77.78%

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