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Tom [10]
3 years ago
14

sarah simplify each of the Expressions what is the difference between the values of the two expressions 3 * 12 - 9 + 10 * 3 (12

- 9 )+ 10
Mathematics
1 answer:
mylen [45]3 years ago
7 0
I don’t really knowwwwwww
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Answer: (21.541,\ 23.059)

Step-by-step explanation:

The confidence interval for population mean is given by :-

\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}

Given : Sample size : n=240 , which is a large sample , so we apply z-test .

Sample mean : \overline{x}=22.3

Standard deviation : \sigma= 6

Significance level : \alpha=1-0.95=0.05

Critical value : z_{\alpha/2}=1.960

Now, a confidence interval at the 95% level of confidence will be :-

22.3\pm(1.960)\dfrac{6}{\sqrt{240}}\\\\\approx22.3\pm0.759\\\\=(22.3-0.759,\ 22.3+0.759)\\\\=(21.541,\ 23.059)

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Answer:

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Step-by-step explanation:

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