isted below are measured amounts of lead (in micrograms per cubic meter, or?/m i
ID: 3372181 • Letter: I
Question
isted below are measured amounts of lead (in micrograms per cubic meter, or?/m inthe air. The EPA has established an air quality standard for lead of 1.5 m. The measurements confidence interval estimate of the mean amount of lead in the air. Is there anything about this data set suggesting that the confidence interval might shown below were recorded at a building or different days. Use the given values to construct a 95% not be very good? 5.40 0.90 0.44 0.85 0.76 1.00 o able What is Round to three decimal places as needed.) A. Yes, because the confidence interval does not contain 1 5 ? / m3 B. Yes, because the sample mean is greater than 1.5?/m3 CYes, the value of 5.40 appears to be an outier D No. the data appears to be normally distributed.Explanation / Answer
The statistical software output for this problem is:
One sample T confidence interval:
? : Mean of variable
95% confidence interval results:
Hence,
a) 95% confidence interval will be:
-0.427 < ? < 3.544
Option C is correct.
Variable Sample Mean Std. Err. DF L. Limit U. Limit Data 1.5583333 0.77229708 5 -0.42691939 3.5435861Related Questions
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