You work for a soft-drink company in the quality control division. You are interested in the standard deviation of one of your production lines as a measure of consistency. The product is intended to have a mean of 12 ounces, and your team would like the standard deviation to be as low as possible. You gather a random sample of 15 containers. Estimate the population standard deviation at a 90% level of confidence. Use 3 decimal places for all answers. 12.11 11.99 11.88 12.04 12.11 12.16 12.18 12.16 12.01 12 12.12 12.02 12.05 12.04 12.27 (Data checksum: 181.14) a) Find the sample standard deviation: b) Find the lower and upper x² critical values at 90% confidence: Lower: Upper: c) Report your confidence interval for σ: (

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 You work for a soft-drink company in the quality control division.  You are interested in the standard deviation of one of your production lines as a measure of consistency. The product is intended to have a mean of 12 ounces, and your team would like the standard deviation to be as low as possible.  You gather a random sample of 15 containers.  Estimate the population standard deviation at a 90% level of confidence. Use 3 decimal places for all answers.

 

12.11 11.99 11.88 12.04 12.11
12 12.16 12.18 12.16 12.01
12.12 12.02 12.05 12.04 12.27

 

(Data checksum: 181.14)

a)  Find the sample standard deviation:  

b)  Find the lower and upper �2  critical values at 90% confidence:
Lower:     Upper: 

c)  Report your confidence interval for �:  (  ,  )

You work for a soft-drink company in the quality control division. You are interested in the
standard deviation of one of your production lines as a measure of consistency. The product is
intended to have a mean of 12 ounces, and your team would like the standard deviation to be
as low as possible. You gather a random sample of 15 containers. Estimate the population
standard deviation at a 90% level of confidence. Use 3 decimal places for all answers.
12.11
12
12.12
11.99 11.88 12.04 12.11
12.16 12.18 12.16 12.01
12.02 12.05 12.04 12.27
(Data checksum: 181.14)
a) Find the sample standard deviation:
b) Find the lower and upper x² critical values at 90% confidence:
Lower:
Upper:
c) Report your confidence interval for σ: (
Transcribed Image Text:You work for a soft-drink company in the quality control division. You are interested in the standard deviation of one of your production lines as a measure of consistency. The product is intended to have a mean of 12 ounces, and your team would like the standard deviation to be as low as possible. You gather a random sample of 15 containers. Estimate the population standard deviation at a 90% level of confidence. Use 3 decimal places for all answers. 12.11 12 12.12 11.99 11.88 12.04 12.11 12.16 12.18 12.16 12.01 12.02 12.05 12.04 12.27 (Data checksum: 181.14) a) Find the sample standard deviation: b) Find the lower and upper x² critical values at 90% confidence: Lower: Upper: c) Report your confidence interval for σ: (
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