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Finger [1]
2 years ago
4

A recent poll of 380 randomly selected Americans showed that 24% ( = 0.24) are happy with their cell phone carriers. The country

’s largest cell phone carrier would like to know, within a 90% confidence level, the margin of error for this poll. (90% confidence level z*-score of 1.645) Remember, the margin of error, E, can be determined using the formula E = z*. To the nearest tenth of a percent, the margin of error for the poll is %.
Mathematics
2 answers:
True [87]2 years ago
7 0

Answer:

3.6%

Step-by-step explanation:

Given that A recent poll of 380 randomly selected Americans showed that 24% ( = 0.24) are happy with their cell phone carriers.

Sample size n =380

Sample proportion p = 0.24

q = 1-0.24 =0.76

Std error of p = \sqrt{\frac{pq}{n} } =0.0219

Z critical value for 90% would be 1.645

Margin of error = ±1.645*std error

=±1.645(0.0219)

=±0.0361

i.e. in percent margin of error

3.61% = 3.6%

Dvinal [7]2 years ago
6 0

THE ANSWER IS 3.6% BECAUSE I JUST TOOK THE TEST AND GOT A 100%

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2 years ago
Yumi wants to make 12 cups of party mix using candies and nuts her budget require the party mix to cost her $1 29 per cup. The c
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Answer:

Acording to the question,

Cost per cup = $1.29

Total number of cups = 12

Total cost of cups = 12 x 1.2 = $15.48

Cost of candies = $2.49 per cup

Total number of candies = x

Cost of nuts = $0.69 per cup

Total number of nuts = y

Equations :

x + y = 12    (because total cups of nuts and candies will be equal to 12)

2.49x + 0.69y = 15.48    (Total cost of the 12 cups should be 15.48)  

<u>Step 1 : Find x in terms of y</u>

x = 12 - y

<u>Step 2 : substitute x in terms of y from step 1 in the second equation</u>

2.49x + 0.69y = 15.48

2.49 ( 12 - y) + 0.69y = 15.48

29.88 - 2.49y + 0.69y = 15.48

-1.8y = -14.4

y = 14.4/1.8

y = 8

Step 3 : Find x

x + y = 12

x = 12 - y

x = 12- 8

x = 4

Thus,Yumi should use 4 cups of candies and 8 cups of nuts.

5 0
2 years ago
The revenue function for a production by a theatre group is R(t) = -50t^2 + 300t where t is the ticket price in dollars. The cos
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Break even is the value of t where revenue=cost or R(t)=C(t)

set equal each other

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Answer:

Principal element is $475.43

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The amount of interest paid in month one is 4%*$117,000*1/12=$390

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The principal element of monthly payment is the monthly payment minus interest.

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