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1. A random sample of 100 households in Skagit County yielded an average household income of...

1. A random sample of 100 households in Skagit County yielded an average household income of $71,000, with a sample standard deviation of $3,800. Assume the distribution of household income is Normal.

a. Use this information to compute a 95% confidence interval for the population mean household income in Skagit County. Please clearly show that you checked to make sure the data meet all necessary conditions for inference.

b. Interpret the meaning of the confidence interval you found in part a in the context of this application.

Math   Statistics-And-Probability   
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Answer #1

We get 95% confidence interval as

($ 70255.2 , $71744.8)

Solution file is attached go through it

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