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3 years ago

10

Maria bought 7 boxes. A week later half of all her boxes were destroyed in a fire. she only has 22 boxes left. How many did she

start with?
(I need an equation not an answer)

1 answer:

Black_prince [1.1K]3 years ago

3 0

You can add 22+7 =29 so Maria started with 29

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Danielle has taken five math tests so far this year. The tests are out of twenty points, and she has gotten the following scores

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2 years ago

Which expression should you simplify to find the 90% confidence interval,

Alex787 [66]

Answer:

$0.45 - 1.96\sqrt{\frac{0.45(1-0.45)}{36}}=0.287$

$0.45 + 1.96\sqrt{\frac{0.45(1-0.45)}{36}}=0.613$

And we can conclude at 95% of confidence that the true proportion of interest for this case is between 0.287 and 0.613

Step-by-step explanation:

The estimated proportion of interest is $\hat p=0.45$

We need to find a critical value for the confidence interval using the normla standard distributon. For this case we have 95% of confidence, then the significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value is:

$z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96$

The confidence interval for the true population proportion is interest is given by this formula:

$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

Replacing the values provided we got:

$0.45 - 1.96\sqrt{\frac{0.45(1-0.45)}{36}}=0.287$

$0.45 + 1.96\sqrt{\frac{0.45(1-0.45)}{36}}=0.613$

And we can conclude at 95% of confidence that the true proportion of interest for this case is between 0.287 and 0.613

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$1.28 or $1.29 would be the price of each can.

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If you could help me with these questions I would appreciate it!

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<h2><u>5/18</u></h2>

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Let me know if you need more explanation, but it's to make sure next time you answer someone, instead of asking! :)

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