6. 7. Sales personnel for City Distributors Inc. submit weekly reports listing the customer complaints made during the week. A simple random sample of 8 weekly reports showed a sample mean of 8...

6. 7. Sales personnel for City Distributors Inc. submit weekly reports listing the customer complaints made during the week. A simple random sample of 8 weekly reports showed a sample mean of 8 complaints per week with a sample standard deviation of 3.464. What is the 95% confidence interval for the population mean? In a survey of 388 human resource professionals concerning challenges they faced in the workplace, 163 said that employee satisfaction was an important challenge. Construct a 95% confidence interval estimate of the population proportion of human resource professionals who believe that employee satisfaction was an important challenge. 8. How large a sample should be used to provide a 95% confidence interval of population mean with a margin of error of 10? Assume that the population standard deviation is 40. 9. A recent sample survey reports that 66% of 18-to 25-year-old consumers are comfortable sharing personal data with their communication service providers (CSPs). To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within 100.03 of the population proportion, how many 18-to 25-year-old consumers need to be sampled?