2 years ago

How do u write all real numbers are less than 69?

1 answer:

5 0

Allrealnumbers<69 is a possible answer

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sertanlavr [38]

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Step-by-step explanation:

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vodomira [7]

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Soloha48 [4]

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Luda [366]

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Ad libitum [116K]

Answer: 239

Step-by-step explanation:

Given : Confidence level : 99%

Significance level : $\alpha=1-0.99=0.01$

Margin of error : E = 3 minutes

Population standard deviation : $\sigma=18$

To find : Numbers of observations are required. (Minimum Sample size)

Formula : $n=(\dfrac{z_{\alpha/2}\cdot\sigma}{E})^2$

Using z-value table,

Two-tailed z-value for $\alpah=0.01$ : $z_{\alpha/2}=2.576$

Using given values , we get

$n=(\dfrac{2.576\cdot18}{3})^2\\\\=(15.456)^2\\\\=238.887936\spprox239$

Hence, the minimum number of observation is required = 239

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2 years ago