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r-ruslan [8.4K]
3 years ago
14

Three different bags of pretzels are sold at the store. Which bag of pretzels is the best buy?

Mathematics
1 answer:
ValentinkaMS [17]3 years ago
5 0

Answer:

A: 11 cents per ounce

B: 11.5 cents per ounce

C: 14 cents per ounce

Bag A would be the best buy

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Answer: 235

Step-by-step explanation:

The formula to calculate the sample size  :-

n=(\hat{p}(1-\hat{p}))(\dfrac{z_{\alpha/2}}{E})^2

Given :  Estimated proportion \hat{p}=0.89

Margin of error : E=0.04

Significance level : \alpha=1-0.95=0.05

Critical value : z_{\alpha/2} =1.96

Now, the required sample size will be :-

n=(0.89(0.11))(\dfrac{(1.96)}{0.04})^2

\Rightarrow\ n= 235.057\approx235

Hence, the required minimum sample size = 235

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