Question

In a study, researchers compared the variability in product of a particular piece of equipment to a known analytic capability to decide whether product consistency could be improved. The following data were obtained for 10 batches of product. Preliminary test results suggest the data are normally distributed and that s 0.485 Construct a 95% confidence interval for the process variation of the piece of equipment under consideration. 29.4 30.1 30.1 30.4 29.1 29.6 29.5 30.2 29.1 30.2 The 95% confidence interval is from 1 to (Round to three decimal places as needed.)

Q5

Answer 1

I have used minitab software

Steps

1. Enter the data
2. Name is "x"
3. Stat-Basic Statistics-1 variance
4. 
   One-Sample Variance One or more samples, each in a column Perform hypothesis test Hypothesized variance Value: v235225 Select Options... Cancel Help OK
   
5. ok

minitab output

+

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Required interval for variance

(0.111, 0.785)

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