# Assume the service times are normally distributed a

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Unformatted text preview: random sample of 22 service times (in minutes) gives s 2 = 8. Assume the service times are normally distributed. a) Find a 95% confidence interval for the overall variance of service time at the bank. b) Find the two one-sided 95% confidence intervals for the overall variance of service time at the bank. c) Find a 95% confidence interval for the overall standard deviation σ of service time at the bank having minimum length. ( “Hint”: Use Table X ( p. 594 ). ) 3. a) 6.3- 2 b) Use Welch’s T to construct a 90% confidence interval for µ X – µ Y “Hint”: equal variances ( without the assumption that the variances are equal ). 4. 6.3- 4 6.5- 4 5. a) 6. 6.5- 6 6.5- 18 b) 7. 6.6-12 a) b) … if we ignore the seed distributor’s claim. … if we believe the seed distributor’s claim;...
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