Sin (62) nearest ten-thousandth

Mathematics

1 answer:

ehidna [41]3 years ago

3 0

Answer:

-0.7391

Step-by-step explanation:

I'm not gonna lie I just used a calculator

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A car company took a random sample of 85 people and asked them whether they have a plan to purchanse an electrinic car in the ne

lutik1710 [3]

Answer:

We have 96% of confidence that the true proportion of people who responded that they have a plan to buy one electric car is between (0.121 and 0.303).

Step-by-step explanation:

For this case the estimated proportion of people who responded that they have a plan to buy one electric car is given by:

$\hat p = \frac{X}{n}= \frac{18}{85}=0.212$

Where X represent the number of people who responded that they have a plan to buy one and n represent the sample size selected

We know that the confidence level for this case is 96% of confidence, then our significance level would be $\alpha=1-0.96=0.04$ and $\alpha/2 =0.02$ . And the critical value would be:

$z_{\alpha/2}=-2.05, z_{1-\alpha/2}=2.05$

The confidence interval for the true proportion is given by this expression:

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

Replacing the data given we got:

$0.212 - 2.05\sqrt{\frac{0.212(1-0.212)}{85}}=0.121$

$0.212 + 2.05\sqrt{\frac{0.212(1-0.212)}{85}}=0.303$

We have 96% of confidence that the true proportion of people who responded that they have a plan to buy one electric car is between (0.121 and 0.303).

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4 years ago

X - 2 = 16 A. 14 B. 18 C. 21 D. 12

Vlada [557]

X=18
Because you would add 2 to both sides so it would be x=16+2 which equals 18

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3 years ago

An object in geometry with no width, length or height is an(n)?

mr Goodwill [35]

An object in geometry with no width, length or height is a point

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3 years ago