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6. (10 marks) A car dealership claims that its average service time is less than 7 hours on weekdays. A random sample of 16 service

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6. (10 marks) A car dealership claims that its average service time is less than 7 hours on weekdays. A random sample of 16 service times was recorded and yielded the statistics * =6.75 hours and s= 1.62 hours. Assume service times are normally distributed, is there enough evidence to support the dealership's claim at 5% significance level? Hypotheses: Rejection Region: Test Statistic: Decision/Conclusion

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