K Consumers' credit is rated using FICO scores. The credit ratings for a sample of applicants for car loans are given below. Use the sample data to construct an 80% confidence interval for the standard deviation of FICO scores for all applicants for credit. Assume the sample is a simple random sample obtained from a population with a normal distribution. 588 681 748 492 (Round to one decimal place as needed.) 497 590 732 547 H 636 531 562 606 700 656 712 599

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