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denis-greek [22]

3 years ago

13

mr ogata drove 276 mies from his house to los angeles at an average speed of 62 miles per hour. how long did it take him to get

to los angeles

1 answer:

Ilia_Sergeevich [38]3 years ago

4 0

About 5 hours. I did this by dividing and rounding 276 by 62. Hope this helps!

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Step-by-step explanation:

We know that the confidence interval for population mean is given by :_

$\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}$

, where n= sample size.

$\sigma$ = standard deviation.

$\overline{x}$ = sample mean.

z*= Critical value.

Given : n= 450

$\overline{x}=20$

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Critical value for 95% confidence = z*=1.96 [From z-value table]

Then, the 95% confidence interval will be :-

$20\pm (1.96)\dfrac{49}{\sqrt{450}}$

$\approx 20\pm (1.96)(2.31)$

$\approx 20\pm 4.53$

$=(20-4.53,\ 20+4.53)=(15.47,\ 24.53)$

Hence, the 95% confidence interval for the mean change in score μ μ in the population of all high school seniors. : (15.47, 24.53)

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Step-by-step explanation:

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