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kakasveta [241]
2 years ago
4

Celia bought a bag of 121212 goldfish for \$3$3dollar sign, 3.

Mathematics
1 answer:
Dafna1 [17]2 years ago
5 0

Answer:  $0.25

Step-by-step explanation:

We are given that the cost of 12 goldfish = $3

To find the cost of one goldfish we use division operator and divide the cost of 12 gold fishes by 12.

Then , the cost of one gold fish =\$3\div 12

⇒ Cost of 1 gold fish =\dfrac{\$3}{12}

⇒ Cost of 1 gold fish =\dfrac{\$1}{4}   [Divide numerator and denominator by 3.]

⇒ Cost of 1 gold fish =\$0.25    [Simplify by dividing 1 by 4]

Therefore , the  cost of 1 goldfish = $0.25

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Answer:

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The p value for a left tailed test would be:  

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Since the p value is very higher we can conclude that the true proportion  of teenagers who floss twice a day is NOT less than 40%.

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Information given

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z would represent the statistic

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We want to check proportion of teenagers who floss twice a day is less than 40%, so then the system of hypothesis are.:  

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For the one sample proportion test the statistic is given by:

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

If we replace the info given we got:

z=\frac{0.3725 -0.4}{\sqrt{\frac{0.4(1-0.4)}{400}}}=-1.123  

The p value for a left tailed test would be:  

p_v =P(z  

Since the p value is very higher we can conclude that the true proportion  of teenagers who floss twice a day is NOT less than 40%.

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2 years ago
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